Cadillac Deville 1994 - 1999 Coolant hose bypass for overheating engine issue

In this video I show a step by step of how to bypass a metal hose that runs under the throttle body and becomes clogged due to lack of car maintenance. This video shows how someone maybe able to unclog the metal hose that is blocking coolant from flowing if the issue is not as severe as the one shown. This is something relatively easy and very inexpensive to perform whether or not there is a visible coolant leak and the engine is overheating. I would highly suggest following along with the steps shown in this video if you are throwing your hands up out of frustration while attempting to address the overheating issue.
I have seen many videos on the coolant system for this vehicle from changing the thermostat, water pump, coolant hoses, radiators, cooling fans and replacing the overflow tank for Cadillac deville however no one has posted a video of this particular issue. I decided it may be helpful to others looking to DIY mechanic how to there Caddy. The Northstar motor is installed on this vehicle so this should help for those with that same north star engine.
This was a job I did for my niece as she had purchased her first car and it is a white on black 1996 Cadillac Deville. There is a special tool used to remove the water pump on this vehicle and can be purchased at a local automotive store. The store may have an option to rent the tool as well.

[@jalasky46]

After watching this video I had to go back and check mine. Behold, mine was totally clogged. Great video!

[@mingojohnson6944]

same here

[@seanmcginity983]

Thanks for video. So far so good. Sean

[@lukebradshaw]

Great video! Sad how many Northstars are diagnosed as blown head gaskets when in fact, only the bypass hose is clogged!

[@johnfox3845]

That only occurs due to lazy or ignorant techs. On these engines the first step is to check the purge line for flow, checking the cooling system for proper circulation, and then testing the system for combustion gas intrusion. Having said that, I've only found clogged lines on cars that had stopleak added in an attempt to repair blown headgaskets. It's a shame that so many N*s experience gasket failure. In the vast majority of cases, the failure is a direct result of neglecting cooling system maintenance. Old coolant turns acidic, eating the gaskets near the head bolt holes. This allows coolant to come in contact with and degrade the threads in the block, reducing clamping force and allowing the gasket to blow. Finally, combustion gases pressurize the cooling system, causing air pockets and preventing nor coolant flow, which leads to overheating.

[@lukebradshaw]

@@johnfox3845 I couldn’t agree more. 10 year, 100k or 150k mile coolant changes are death to an engine no matter what type of coolant you use. Had Cadillac required coolant changes every 2-3 years, many Northstars would still be on the road that aren’t anymore! People will disagree and say the head bolts pulling out is the cause. What they don’t realize is that corrosion causing coolant intrusion around the head bolts is what causes them to pull out. Maintenance, maintenance, maintenance!!

[@abdullahyaseer7181]

I am from the Kingdom of Saudi Arabia I was suffering from this problem thank you very much 💜💜💜💜💜

[@TheDaveization]

After watching this I went the other way and replaced the metal hose with rubber straight to the inlet on the thermostat housing. I left the short metal hose under the intake inlet and didn’t remove the inlet at all. I just ran it straight across the block with a lil extra hose for good measure. Instantly brought the engine down to proper temp. Now after flushing radiator and engine independently and adding all Dex, it stays below 215 in the FL heat. Thank you so much, I hope this helps many more people.

[@schoolgirlrosie]

Excuse did you say below 215 ? Wow so 215 is normal ? What is normal for these dang engines if you know please tell me I'm dealing with the same issues

[@schoolgirlrosie]

@nestor aguirre 220 and is bad

[@locosiete6839]

Thanks for making a easy and straightforward video.

[@MyDerfderf]

Finally , I found the video I needed. … oh wait, I can’t hear a dam thing. Moving on.

[@willitmakeit]

I have to say tho my Northstar still over heats this was clogged up. Thanks so much for posting this video. I have a bad head gasket. I've tried blue devil before with great results in my old 1996 caddy. So im going to try this in my 1998 caddy hearse and hope its only gor 67k miles on it. Thanks again..

[@nickyscarfo1]

omg you are a life saver, such a simple fix.

[@repairbuildcreditservicesllc]

I applaud your creativity and resourcefulness to keep your car from overheating .... however, here's some advice from a car mechanic who knows how to work on Cadillac cars: the throttle body is meant to be warmed by the "hot" mixture (of water and coolant) flowing through it to warm the air before it goes into the intake manifold, thereby expanding the airmass flowing to the engine through the intake manifold where the fuel injectors then add fuel the warm air so it burns in the engine. The car's computer (the ECM) monitors the mixture temperature to keep everything running well at "engine operating temperature (approximately 180 - 210 degrees Fahrenheit). By bypassing the hot mixture past the throttle body thereby NOT warming the air in the intake manifold, on cold days the engine may run OK but will not allow the air to the throttle body to be warm enough resulting in a rich burn (more fuel than air proportionally) mixture of air and fuel. The result is poor gas mileage and an engine that doesn't run properly even though you solved the overheat problem. If I had to do this fix to keep me on the road until I got to where I could fix the engine properly, your fix is ideal and comes in handy. However I don't believe your fix would provide a long term solution without adverse side effects to how your engine should run properly. To properly fix your car you should clean out or replace all water hoses (metal, rubber or parts where mixture should flow) to ensure proper flow. Good job though!

[@DoItWithDave]

I understand where you are coming from and I want to thank you for posting you're comment. You have added valuable information to anyone who's car is having overheating issues. I agree, the throttle body should ultimately be replaced.

[@tammythigpen7547]

Do It With Dave

[@Nunya_Beezwax]

Well, that is a total crock. The air/fuel mixture will be gauged by readings from the IAT (intake air temp) sensor, and has nothing to do with why the coolant runs through the throttle body on these cars. The reason they run coolant through the throttle body is for when the car is operating at freezing, or below freezing temperatures, to ensure that the metal blade of the throttle plate doesn't stick or hang inside the aluminum throttle body. Aluminum sweats, therefore could cause condensation inside the throttle body, which would freeze, causing a stuck or sticking throttle.

[@remingtonnoble7362]

thecarguy what’s the name of the part he’s cleaning. Trying to order one

[@r100scammellpioneer9]

Excellent Dave , perfect vid , just what i need to know and now can do . Thanks Mate.

[@ersonthemesa]

Thank you for your advice !

[@Tom-wq2mz]

Note Cadillac along with many other Manufacturers use metal line's on top the intake to prevent melting. You can use a high temperature rubber hose and get great results. A tip use the next size bigger hose for better flow. It works great. When breaking a HAVC system on Cadillac always use 2 Coolant seal pellets to reseal the system. Cadillac dealerships use them as well as the factory's.

[@uh8302]

They put out an advisory to stop using them because that's what would clog those metal hoses in the first place

[@brianamorris3254]

Thank you my husband and I never thought about that pipe, we were doing everything we thought would work buying parts here and there only for it to continue to run hot. this video is very useful and helpful ......

[@michaelmechtel5179]

Thanks Dave, great video. Im having issues with my 99 right now. Before i change my thermostat I will check to see if that pipe is clogged. Looks like a lot easier fix

[@DoItWithDave]

Thanks for watching!

[@marcusgoodwin2772]

Just got my 99 Deville out the shop last week and I'm having overheating issues when I drive for X amount of miles. I will give this a test tomorrow to see if it fixes the issue

[@uh8302]

Did it ever fix the issue?

[@marcusgoodwin2772]

@@uh8302 I don't even think I tried it.. I got rid of the car, I have a 08 Dts now with 128k on the dash....no problems so far

[@AllAroundHnadyMan]

Great job!

[@gillessteichen3655]

Awesome dude!! As simple as efficient. - Thxs a million

[@nathanbennett9025]

thank you so much this video was meant for me

[@randellbrumfield1505]

That build up is from those pellets they recommend putting into the radiator

[@whycantthisbeblank]

Thanks for the video Dave! Only comment I have has nothing to do with mechanical issues, just audio. It would be nice if you ran the audio channel through a volume filter to get the volume higher. There are plenty of free video editing programs that do this. You can also use said software to cut out or lower anoying background noises, but I don't think you have an issue with that on this video, just very low volume.

[@DoItWithDave]

I've gotten this comment from quite a few ppl. Definitely should have double checked before posting. Thanks for watching!

[@zackveneta1998]

yess anything to prevent the engine from over heating will work on these 4.6 and 4.9 caddys and there areother areas where there is a difficult area to axcess and the hose clamps have to be tightened great to get the car cooled off>

[@johndrennen8342]

Hello, do you have any experience or advice pertaining to bypassing the other metal coolant crossover lines (the ones that are routed behind the engine) mine are rusted & clogged and apparently just to gain access to these lines is incredibly labor intensive. I know there's a process similar to the one you demonstrated to bypass them but I'm unable to find detailed instructions of any kind. Thank you in advance.

[@evgeni131]

Wow ,thank you

[@davidturner2113]

Very interesting.

[@edwardcoyle5425]

I did a similar repair but replaced my hoses with clear coolant hose so I can see the flow in the future.

[@alejandroretyu]

Edward Coyle where did you find clear hoses that fits?

[@alejandroretyu]

Edward Coyle thank you so much bro 👍

[@JoseMartinez-hw1rk]

That metal hose is attached to the Throttle body correct? I couldn't really see good underneath I'm having same issue but that metal hose is attached to throttle body so not sure if air is getting in or not

[@Smokey1226x]

great video, do you know the reason as to why the coolant in the reservoir tank diminishes little by little even if the engine is turned off? the car shows no signs of leak

[@mm3oo3]

TheGamingFox hey buddy I am having the same issue it's 1997 caddy deville. My car is over heating and I am losing coolant weekly.

[@DoItWithDave]

Hello I apologize for the delayed response. There could be a small leak that is so little that it shows no signs of it existing. If you have not already done so you could try laying a large piece of cardboard under the car overnight and or run the engine for 15 minutes or so to see if there is any visible evidence of a leak. Checking the engine bay for wet spots may be helpful in addressing the issue. Also there could be a small leak in the cabin coming from the heater core. You could check under the passenger side carpet for any moisture. Other than that Im not sure where else to look. I hope this helps. Thank you for watching.

[@martygomez308]

Hey how are u..i like ur video..it did show me in detail which its easy to follow..but I have a question..i changed the thermostat my water pump is running good..but still running hot..water i flowing thru.. do u have any guesses of what it might be..thank u

[@DoItWithDave]

You may want to look into the heater core. They do get clogged and can prevent the coolant from flowing correctly. It can be a pain to replace however I've seen people do a bypass for the heater core by disconnecting the inlet and outlet tubes from the core and connecting them together with a pipe insert and clamps. I hope this helps.

[@diyboyssidandtimbo9372]

Buddy im just wondering how that rubber hise worked out laying on the manifold under the throttle body.

[@ka-waiimoon4288]

Hey, great video.. Does anyone know what that metal hose with the crinkles going from the throttle body to the waterpump housing is? Trying to take it off today, the lower bolt broke off while trying to remove it. The hose appears to be for coolant, judging where its going (the water pump housing). Is there a way i can use a good enough screw and drill it in there since the head of the bolt broke off clean? , or will i have to drill tap it? Trying to take the easy way out, or at least not have to drill tap it. Any help is greatly appreciated. The answer is probably obvious to a mechanic, which i do not claim to be. I just do not see myself coming into that kind of labor money.

[@blackericdenice]

Drive it to a car wash give the engine a bath. I just uploaded a video of me washing my 2001 Deville. The water will not hurt anything.

[@recreacionaltelpochapa6122]

1999 Cadillac Seville SLS change water pump, thermostat, bell make bypass, is continue heat, no white smoke and nothing mix with the oil. Take the thermostat off and continue heating. No check engine. I’am think where are the problem??? Thanks you The car running good 😫

[@davef4728]

Interesting i have a 99 deviled and it runs super hot in city driving about 212-222 but on the highway it will run at 187-197 do you think I gave the same issue? I’ve cleaned out that plastic fill tank changed the thermostat and the radiator cap and same thing! It drives me nuts! I want this car to run cooler in city stop and go driving it would be a great car if I didn’t worry about it overheating so much!

[@DoItWithDave]

Dave F you may want to check whether or not the heater core is clogged. Also the heater core can be bypassed if needs be. I hope this helps.

[@sushirollusa]

I have a 99 with 44k miles on it does the same thing . beautiful car but runs hot in city driving . The Manuel says put in neutral when in city and traffic conditions when you come to a stop ,, still does the same .

[@mavadoroaster]

Those temps are actually normal.. the fans don't come on until 224 and shut off at 212

[@nickyscarfo1]

so one should do more frequent radiator flushes to prevent gunk from building up on your hoses ?

[@DoItWithDave]

Absolutely I've had a couple cars have blockages from old coolant build up.

[@peter455sd]

Gotta fix the audio bro,this is a great video

[@roberthines2382]

did you leave two open hose that you remove there still off right and will they leak?????

[@DoItWithDave]

If you are asking about where I removed the hose under the throttle body then no I did not reconnect anything back to the throttle body. The connection under the throttle body is just a was the manufacturer used to run the hose without it touching other parts of the engine.

[@gtzglvez]

I had the same hoses cloged up in my 96 eldorado,.car wont hot anymore ,stays under 225 f. Everyone with the northstar should check their hoses to be clear

[@raybenton4236]

francisco villa 6

[@schoolgirlrosie]

225 omg my 99 runs up to 210 . I though that was bad what is normal please help

[@themachete6715]

So what did you end up putting on the metal hoses under the throttle body since you now use the bypass?? A hose that connects them?? I wanna try this on my 99 deville

[@DoItWithDave]

The Machete I honestly left the metal hose around the throttle body disconnected completely. From what ppl have posted on this the metal hose has something to do with the heat of the throttle body keeping it at a regulated temp. In my case I didn't want to purchase a new one and it doesn't seem to effect the throttle body at all. These cars are great but the overheating issue is insanely tedious to fix. The car in this video also had a heater core clogg. Living in FLA i could bypass the core as well and safe time and money. I hope this helps.

[@themachete6715]

Do It With Dave I see, so you installed the new hose into the Hollow bolt str8 to the purge line but didn't attach it at the metal hoses surrounding the throttle body, got it. It's crazy how that lowered the heat levels. I cleaned out my purge line yesterday found a bunch of black gunk coming out of it. I didn't use your hose bypass method but I'm going to do that this weekend when it stops raining. So what temps were the deville riding at before you cleaned our the purge line and how does it run now in comparison?? And do you have a video on how to bypass the heater core???

[@lloriemartin2567]

just recently got a 98 deville been driving it since tuesday when i got registered now today thursday it just started leaking coolant to the point i had to pull over to see what was happening no warning or signs of a leak before that happened any thoughts

[@DoItWithDave]

Sorry for the delay in communication. If you haven't already had this issue fixed then it sounds like something that would allow a lot of coolant to leak like a hose or possibly the reservoir tank. Thankfully these things should be relatively easy to access. I would try filling the coolant lines with distilled water and running the engine while checking for the leak. It should be pretty straight forward.

[@gbegaye4080]

how do I check to know how much coolant I have in my '97 DeVille??

[@cammin3363]

Should I do this on a 99 Seville sls?

[@SuperHammerzeit]

What are these pipes? they go from where to where? So coolant is circulating in motor by water pump. Then when coolant is hot thermostat opens and then coolant circulates also in radiator. WHO THIS COOLANT RESERVOR AND THESE PIPES ARE CONNECTED TO THE REST OF THE COOLING SYSTEM?? Are there just in- and outlet from coolant reservoir?

[@roberthines2382]

so i can do the same on my 99 deville its running hot also. ..so the open lines you left open do they leak?

[@DoItWithDave]

The metal line under the throttle body was bypassed in this video. I deleted the need to run the hose through it by running the hose around it. The metal pipe will not leak in this situation. I hope this helps.

[@rosaorozco42]

😊 thank you

[@jesusjessegonzalez191]

Does the hose on the right of the tank go to anything. Top right of the tank

[@russf6572]

I have my volume up FULL .and can't hear you. Are you in another city when talking here?

[@DoItWithDave]

My apologies for the audio. It may be an inconsistency with the upload over the YT platform.

[@dannygreen3779]

If next video plays speakers will explode

[@Nunya_Beezwax]

My coolant tank is on the opposite side of the engine compartment on my SLS.

[@hrra8759]

only mice can hear him lol

[@georgenegrete4223]

Hahaha

[@daviddobiesz]

How hot was it running? My line appears to be flowing because it gets hot. Just curious as to the temp it was running beforehand.

[@DoItWithDave]

The display on cluster board showed temp jump up to 260 which is way to hot for the car to operate safely. Since I posted this video the caddy 3 more hoses replaced that started to leak. I assume it was a result from replacing the couple things mentioned in the video and the higher pressure doing what it does caused the hoses to fail. In my experience coolant systems can be a pain from chasing all the leaks after fixing 1 or 2 components.

[@roberthines2382]

so is it running ok

[@DoItWithDave]

It is running fine now. But like I stated before after replacing a couple leaking hoses. It seems like clogged coolant lines are a very big issue with this engine.

[@johneric3886]

Excellent work good video footage good communication skills

[@stacybrown1425]

Ok I've gone through all the hoses that go to and from the over flow tank and took out the Purge bolt and there was no obstruction , and there is fluid flowing too and from the over flow tank. So while I was messing around the over tank I saw a relay plug or should I say half of one being as it is not connected to and thing. There is very little lead wire on it and it seems to be attached to something under the over flow tank? Do you know what sensor this might be? Wires come out one side but the clip side looks like the wires are cut.( 2 wire holes ) and also I noticed that there is a panel on the passenger side attached right under the windshield that has wires plugged into it but on the end it has an hole that something plugs into ? And ! more thing There is a shinny metal round piece that sits right next to the over flow tank and has a pipe that runs towards the windshield with a couple of valve looking things on it and a three way wire configuration 2 of the wires are connected to something but one is not , it is hollow and I was wondering if that is what goes in the hole on the wiring harrness by the windshield , it seems to fit in the hole.

[@DoItWithDave]

So you responded with a lot...lol. I think the wire attached to the tank is a low coolant sensor. As for what is under the windshield it could have something to do with defrosting? The shiny metal, I have no idea. I'm definitely no expert I just do what I can with whatever information I can find on the Internet when attempting to fix an issue with whatever I'm working on. You may want to search for a Cadillac forum online and see if anyone has posted similar information as to what your inquiring about. Those forum groups usually have a lot of information to offer. I wish I had more insight for you. This was my nieces car at the time so I'm not able to pop the hood and see exactly what your looking at.

[@christopherharris8904]

Wonder if it works on a 2001?

[@mustanggt5985]

At 2:54, can anyone tell me what grey aluminum or iron piece is right below that metal pipe, with the numbers on it. There is a gasket inside of it and mine is blown. Help please.

[@alejandroretyu]

Yoo I also want to do this but my hoses are literally glued to the purge line and I need to break the hoses to take the purge line off. Problem is idk wtf the part is for these hoses and online it seems off. Does anyone know a link to buy these hoses for a 05 Cadillac deville?

[@recreacionaltelpochapa6122]

High temperature hose 3/8

[@rafaelmartinez2596]

YESSSSSS!!!!!!!!!!!!!!!

[@davidjames666]

How about cleaning out the infamous "bolt with a hole in it" that is on the engine side of that hose? It has a tiny hole to allow steam and thus air to vent out into the surge tank. Yep, this obstruction causes air pockets which prevent the thermostat from opening and cooling the engine which causes head bolts to get stressed, and pull out of the block.

[@LamassuSound]

more info on that please

[@davidjames666]

LamassuSound on the engine side of the rubber hose coming from the surge tank is a bolt that can be screwed out from the engine. The little hole can get plugged up with unapproved stop leak, or gasket material from a sloppy water pump repair or such. It is best to remove the bolt, and clean the little hole out, and not just push a wire thru it, as the gunk will come back and plug the hole up again. The purpose is to allow the steam that is created from hot coolant to vent into the surge tank. If this steam can not exit the coolant passages in the engine, an air pocket will form preventing hot coolant from hitting the tip of the thermostat causing it to heat up, and open (The hot air will not cause a thermostat to open). If your car is overheating, also check the waterpump tensioner to make sure it still has spring to it. Also the car should have 50/50 Dexcool and antifreeze. Too much water will cause too much steam, and the car will not cool.

[@Dannyboy-nj4wh]

David James dex cool is no good and has caused major failure to a shit load of GM vehicles and there have been a bunch of law suits. do not use dex not cool

[@jimfarmall2898]

Ethylene Glycol Antifreeze , the old proven stuff. Dex Cool was another GM blunder, but they cant admit it publicly, or they will have law suits up the gazoo.

[@michaelmechtel5179]

Can you tell me more or contact me with more information on this bolt with a hole in it please

[@stacybrown1425]

Does it bypass the thermostat? And how will that effect the engine?

[@DoItWithDave]

So this is an over flow line that sends coolant back to the reservoir when pressure is too high. I did this because the original line was clogged. It helped with engine overheating however it wasn't a complete fix. The real issue was the heater core. That was completely clogged and was stopping the coolant from properly flowing. If you live somewhere where you need heat the heater core needs to be replaced. If you live in a warm climate like Florida you can bypass the heater core and that should allow the coolant to flow as it should. Basically locating the heater core, removing the two hoses that are inlet outlet lines and join them together with a stent and hose clamps. I hope this helps.

[@davidadamson2588]

Do you know what size hose to ask for to replace the crossover pipe & about how long a hose altogether?

[@DoItWithDave]

I think I got a 1/4" inside diameter tube.

[@DoItWithDave]

You may want to get 1/2" inside diameter might make it easier to slip over the connections.

[@arianasalazar6725]

My car actually started overheating after i cleaned the same lines. Builds up pressure on the top radiator hose but when not pressured up the hose feels like it has no water.

[@Fernandez.1987]

How bad did it overheat my 97 Seville gets warm a little over half way and creeps up and down is that what happen to yours

[@DoItWithDave]

Hey there, after going through the entire cooling system the final clog was at the heater core. It can also be bypassed but if it's clogged bad it is a replacement.

[@MoSJuve777]

what does it mean if my coolant reservoir isnt circulating to the radiator and motor?

[@DoItWithDave]

I'm not sure exactly what you mean. The reservoir should be a the fill line after the engine runs and the appropriate amount of coolant is added. If you drained everything then filled reservoir and the coolant level isn't dropping after running the engine it could be a water pump issue.

[@jonathanthechristian5558]

What size of hose did you use?

[@DoItWithDave]

Honestly I don't recall I'd guess 3/8" or 1/2". I brought the part to the auto store.

[@jonathanthechristian5558]

Do It With Dave thanks

[@jesusjessegonzalez191]

I’m leaking antifreeze from bottom of car and when inspecting the tank I found that the hose on the top right hand side was just dangling

[@galegregory97comcast]

I HAVE A 1999 JUST THE LEFT SIDE AND JUST RIGHT SIDE OF MY RADIATOR GETS HOT FAN IS NOT ON CENTER IS ICE COLD NEW WATER PUMP IN IT. ITS OVER HEATS WHEN I DRIVE IT, JUST SETING AND RUNING IT WILL NOT GET HOT LOL?? WHAT YOU THINK

[@DoItWithDave]

Hello sorry for the late response. It kinda sounds like the radiator may be clogged. Im basing this on what you commented about the left and right side of it being hot however the center is cool. Could be coolant pressure building up on both sides trying to make its way through the radiator but has no clear passage. You could try flushing the radiator then with the lower hose disconnected shoot water from the top and see if it makes it way out the bottom with ease. At least that way you can determine if the radiator is allowing flow.

[@galegregory341]

NO ITS NEW

[@DoItWithDave]

Ok. I don't know what you've replaced if you have not already installed a new thermostat you may want to give that a go.

[@galegregory341]

Radiator thermostat hoses water pump

[@DoItWithDave]

The only thing i can think of is maybe the heater core. Turn on the heater while the car is running and see if you have heat coming out of the vents. If not try to get access to the heater core inlet and outlet pipes and removing the hoses see if you can get water to flow through. There could be a build up of pressure do to a clogged core.

[@Hakimfarhat]

I want to delete the heater core hose is it possible?

[@DoItWithDave]

You can bypass the heater core however I think the hoses still need to be a part of the system.

[@kevinlopez8010]

What is that metal hose called with the bolt on it

[@DoItWithDave]

Its called a purge line

[@kevinlopez8010]

@@DoItWithDave that’s also for the Egr correct?

[@grkid89]

I tired this, and still no luck with solving the overheating issue. Guess its time for a new car. (I have 1999 Seville STS.)

[@vanessamathias5228]

I just bought a 96 Cadillac Seville. There was hardly any oil in it when I got it. I drove it home and got some oil in it. On the way home the temperature gage stayed below the half way mark. As the oil went through the engine; the noises it was making started to go away. I left it running for a bit and then antifreeze started coming out of the bottom.. Right below the surge tank.. There were two running lines of it. Please tell me any opinions.

[@DoItWithDave]

Vanessa mathias check the tank for any cracks. If it looks good then the hoses could be the cause. Leaks can be very tedious so try not to loose your cool. I hope this helps.

[@vanessamathias5228]

Do It With Dave yes. ..there were cracks in the plastic tank on the end of the radiator.. I got a soldier gun and fixed them.. Haven't had any issue since.. at least in that area..lol. I am leaking a small amount of oil. I found where it is coming from...its a seal in a gasket by the spark plugs in the back. However, I don't understand why I don't see the oil level going down. any opinion on this? Plus, sometimes it misfires when I start it.. But the engine sounds really good.

[@DoItWithDave]

Im glad you were able to seal the coolant leak. From what you posted about the oil the valve cover gasket could be the culprit. A misfire is not always cut and dried. There are many factors involved. I would recommend checking for any vacuum leaks in the engine bay.

[@AD-uq4pz]

This engine just blow chunks. Period.

[@meeeoooow]

Compressed air/use air compressor to blow out lines.

[@ka-waiimoon4288]

Oh, its a 1997 seville sls northstar

[@remingtonnoble7362]

What’s the name of the part??? I’ll just buy another.

[@DoItWithDave]

In this video I used a hose to bypass the clogged throttle body coolant line. I hope this helps.

[@remingtonnoble7362]

Do It With Dave can I just order the part from gm or oriellys?

[@DoItWithDave]

@@remingtonnoble7362 you should be able to order through one of them, however unless you need it new, a rebuild on eBay is probably a better deal.

[@dukeman7595]

There is no audio , just barely , It's ashamed the video is good.

[@LamassuSound]

audio is fine

[@dukeman7595]

It would be fine if there was audio.

[@johnross5578]

I CAN HEAR JUST FINE

[@pdv9184]

the Audio could higher, otherwise a great video

[@g32k]

i can hear it perfect what u talk bout

[@Fernandez.1987]

1997 Cadillac seville sts I've changed thermostat , temp sensor and one fan relay and still heats up , no cross contamination in the oil so no bad head gasket . Idk what it is ... And fan don't turn on after chanhing one fan relay maybe I need to change the other two idk I'm lost anyone

[@DoItWithDave]

You may want to check if the heater core is clogged. I have seen videos of people bypassing the core altogether, which is fine in the summer but, "winter is coming".

[@Fernandez.1987]

But heater works if the heater core would be clogged it wouldn't blow hot air right .

[@DoItWithDave]

@@Fernandez.1987 hot air is a sign that hot coolant is in the core, however it may have a back up do to a clog. I don't remember exactly were the core is on this car but it should be fairly easy to access. You could remove the inlet and outlet tubes and run water from a garden hose through the core. If it flows then heater core is probably ok. Also if the inlet and outlets are plastic take care not to crack them if you end up trying this out.

[@Fernandez.1987]

Okay will try this and see what happens thanks

[@johnhenryholiday4964]

thats what that orange anti-freeze crap does.... my personal mechanic hates the orange junk.... he switches the vehicles over to the old style green..... he has NEVER had a car back to him for overheating issues....nor for rust or corrosion issues....

[@bonniejohnson1518]

it works very well but you must not have any air in the system. Air causes the problems of the coolant mudding up

[@rodneythomas579]

No doubt dexcool sucks I know it looks like Satan's butthole in the radiator of older gms it's poison

[@micgregra]

This is what happens when you use different kinds of coolant.

[@someone7773]

Do you know the best coolant to use on these Cadillacs? Because this problem happened right after putting green antifreeze in

[@brianhawk1854]

I'd replace the shitie lil meatle line. With a bigger dieameyer line.

[@cfed95]

Speak up I had to turn my tv volume all the way up to 100

[@ynrlock9315]

Micheal Rosen

[@chacorodriguez2790]

Good morning Brother, get up and smell the coffee. Despacito y con cuidado con las rodillas. Tomate Tonico Tres SSS. Aqui and BOBBY limpiando sus solares. Brother I'm doing good with my speech therapy.overall getting around but at a slower pace. I noticed that my VA Clinic appointments are being stretched out. I har

[@gwendolynapacanis8978]

Audio very lLOW. Mot able to hear 😒

[@gerrie7407]

please fix your audio dude, its a helpfull video but your sound is crappy

[@DoItWithDave]

Yeah I see a lot of comments saying the same thing about the audio. I didn't realize after I uploaded that the audio is so low. I appreciate you commenting and I am making sure the audio is better in the videos that I put out.

[@jamesgross6466]

can't hear you.

[@DoItWithDave]

There have been a couple of ppl who mentioned the audio was way low. I apologize about that.

[@donniejames4748]

speak up dude cant hear you

[@johnc-nr6zd]

too bad i cant hear it..............

[@oldsmobileaurora7418]

Why is every North Star engine I see so filthy looking?

[@slofco]

i have 1997 deville North Star and it's pretty clean.

[@elmerpacheco1513]

Couldn't hear a single word have no idea what you trying to do

[@slofco]

turn it all the way up to 100 on a pc .. if using a phone to watch it will suck