Yeah, it didn't seem all that simple to me either.
@moterdude19595 жыл бұрын
From someone that has worked on all there own car maintenance for many years I do like your video. I do it the same way many times as you showed in your video. I have a good pointer to share with you and the others. Before doing the antifreeze flush and change find out what your cooling total capacity is and when you do the refill put in half the total capacity of undiluted antifreeze first before you add any distilled water. This way you end up with a 50/50 mixture of coolant and water. Its that simple.
@SilentOneCorajuda132 жыл бұрын
Very good video. No filler content, no blaring music, and straight to the point! Thank you for the tips on flushing the system. 👍
@mmg1design6 ай бұрын
👍Good sense of humor.
@condor56355 жыл бұрын
Gotta love being able to get under your vehicle with a 5 gallon bucket without jacks! Thanks for the video
@Anna-tc6rz5 жыл бұрын
I cant even get under my car without Jack's. My boobs get in the way -_-
@FoamSquatch5 жыл бұрын
My absolute favorite part about owning a lifted XJ.
@NazimUddin-yk2tz5 жыл бұрын
@@Anna-tc6rz pics of boobs or didn't happen ,,,,
@NickNick-wn1xy5 жыл бұрын
My 84 blazer
@XEatmorechicken5 жыл бұрын
@@Anna-tc6rz prove it :p
@showandgo5 жыл бұрын
You have two best qualities, humor and knowledge. Thanks for sharing.
@obi19883 жыл бұрын
O my cheap jeepin. I just changed my water pump and thermo for the 2nd time in 24 hrs. Just kept leakn. Till i found a penny heads up. I picked that penny strait up. Then tightened down a few lbs extra on the bolts n no leaks. Hr later watch Matt do the same thing n give me a big smile. What a guy. I really think he helped me fix it somehow.. Magic penny tighten trick..
@Robiam856 жыл бұрын
I flushed my system a few times on my ZJ. Was clean but had a lot of scale and other buildup that I could see. Dumped half a gallon of cleaning vinegar in the system and the rest distilled water. After letting it run for a few days, I drained and refilled with water and couldn't believe the amount of buildup that came out. Like you said, it looked like chicken water but times 100. Thank you for the video!
@VanLife4TheLord3 жыл бұрын
Thanks for making a straight forward diy. I just recently got my 1st Jeep. Got her cheap, but when I took it to my mechanic to get oil change & diagnosis discovered a blown head gasket. But before full panic mode kicked in.... think he saw the look, he told me how he fixed his with these fix-its in a bottle. Thank God for technology :) I use two K-SEAL Ultimate & FiberLock. When I went to see him after her 1st treatment he was glad to see less smoke. Unfortunately she's still smoky when we first get going. Wanted to entirely flush the system & your video was just what I need. Thanks for making these for backyard mechanics 😀 I subscribed
@nainnub12 жыл бұрын
Best No nonsense directions ever, A really good way to do what needs to be done correctly!
@XEatmorechicken5 жыл бұрын
when flushing the block, you should restrict the bottom hose so the water backs up through the system, otherwise all your flushing is the waters path of least resistance if that makes sense. Your likely missing more then half of the system.
@kayduncan85664 жыл бұрын
Their is a drain bolt on the bottom of the engine block ,that drains antifreeze, most of these video's dont mention that.
@rohitbhatnagar75993 жыл бұрын
Tap water is used to flush the system - it contains alot sediments (eg fluorine, Mg, Iron) that can damage engine. I noticed in end you use distilled water & antifreeze - which is good. Distilled should be used for everywhere
@jonmo2694 Жыл бұрын
It won't unless left in there
@60EFFIE5 жыл бұрын
I missed the “one easy step” part..
@HeartSoulLeake4 жыл бұрын
Ditto 🤔
@cleetismcdougall54254 жыл бұрын
It was one easy step to get antifreeze in your eyes.....pay attention people!!
@danswojanovski25493 жыл бұрын
Most flushes require 3 to 6 flushes to get the system clean....the way this guy did his only required one. One easy step
@valjean20363 жыл бұрын
Me to
@ak47hoqwa13 жыл бұрын
Add lots of dish soap. Lok
@AntonioClaudioMichael Жыл бұрын
It's amazing how much more exspensive Concentrate is Now days Compared to 50/50 Mix
@andrewwilliams3063 Жыл бұрын
This is the best flush video on the internet. Very informative as well. Thank you.
@unitedwestand56024 жыл бұрын
Easier way to flush the whole system is just open/remove the petcock put hose in de-gas/reservoir to keep it full while draining start the car and let it idle until it reaches operating temp. Then the thermostat will open and you can rev it a little while keeping an eye on the temperature gauge and then shut the engine off after a few minutes. Remove the water hose let the water drain from the petcock then reinstall. Fill with distilled water and concentrate coolant at about 70% coolant because there is water left in the heater core/block so once it mixes it’ll be close enough to 50/50. Easy 👍🏻
@Brykk7 жыл бұрын
Side note, when doing this for overheating Its also a good time to spray/blow out the debris from the radiator fins. Spraying or blowing from the backside of the radiator towards the front to remove the grass, dirt, and debris that collects in the fins over time. It can really make a huge difference, especially on older vehicles that have collected a lot of debris. Just a thought.
@safetyfirstintexas4 жыл бұрын
Add some shampoo to pull out the dirt and dust in the fins
@religionishipocrisy4 жыл бұрын
@@safetyfirstintexas and don't forget the conditioner either, for those dry brittle radiator fins. helps the fins stay more manageable and adds a healthy shine.
@michael1023 жыл бұрын
@@religionishipocrisy Would you recommend Mane n Tail?
@charleschapman4733 жыл бұрын
This was a huge help. Have to do a system flush & replace the radiator & heater hoses on 2002 jeep wrangler. Very helpful.
@t547607 жыл бұрын
"How To Super Flush your Cooling System in One Easy Step". One Step? You weren't kidding about being math challenged in earlier videos lol. Thanks for the video. Good info.
@markbrooks72577 жыл бұрын
One step this way vs the Chrisfix way where you have to flush, run the car, flush, run the car, etc. I love Chrisfix, but this way gets it all done at once.
@gaylandbarney22315 жыл бұрын
it was the koolaid flavored chicken water he drank , slowed him down a bit
@XEatmorechicken5 жыл бұрын
it is one step as opposed to the draining and filling 10 plus times that it would take otherwise to clean a system that thoroughly
@watrousmark4015 жыл бұрын
Park with your nose uphill when trying to burp the system, after it cools more air will be at the radiator cap, speeds things up
@XEatmorechicken5 жыл бұрын
this is irrelevant since all the air will dump into the top of the radiator and stay there anyways. maybe a tiny pocket in the upper hose but the reservoir will resolve that for you without intervention. thats its purpose...
@chadjsaul4 жыл бұрын
That is what the service garage does if the rad cap isn’t the “high point” or if the heater core possibly trapped air.
@siachen66805 жыл бұрын
Thank you for this detailed video. Lot other videos on youtube skip some important steps like draining the distilled water completely from engine block and heater core.
@JaneBanner-cm5qe Жыл бұрын
Thanks!
@stevenzych2105 Жыл бұрын
Great video! Straight forward clear and concise camera work and instructions. Excellent how to! Thanks
@waynesanders14067 жыл бұрын
We need a video on how to install a drain petcock with a hose so you can drain every drop directly into a bucket. I'm tired of getting radiator showers as well. Since I've pulled engines 4 or 5 times you would think I would have done that by now. Also, another good reason to use only distilled water is electrolysis. That's where the rust in an engine comes from (especially if the engine is iron, and depending on where you live tap water's conductivity can vary greatly). Tap water (or any non-stilled water) has particles in it that make it electrically conductive. You actually get current flowing through the coolant system since all of the grounds for the vehicle end at the block. Electrons actually flow from the negative into the positive.
@nightster_lp7 жыл бұрын
I never wanted anything other than my XJ until I saw you turn the heat up from 66. I haven't had AC in.... ever.... sounds nice...
@bleepinjeep7 жыл бұрын
+Tony Clark ha, it doesn't work
@wildbill23c6 жыл бұрын
The automatic climate control is the only thing my current ZJ doesn't have that I miss from my previous one. Wish I could swap in the automatic climate control and the driver information center from another ZJ into my current one. Those 2 items were nice.
@Thepriceisright7222 жыл бұрын
I ran into you and Colt at Rapid Citys 4x4 101. Talked to you for a minute about cherokee videos and you told me you have covered it. Let me tell you once i think ive seen it all there is more content for my ol xj. Thank you sir!
@ralfie88014 жыл бұрын
Just go to an auto supply and pick up a Prestone engine flushing kit. Splice the appropriate tee into the heater outlet hose, put the discharge spigot in the radiator filler neck. Now connect your garden hose to the tee you put in the heater hose, turn the water on and start the engine. Let it run for about 10 minutes or so. Drain the water, disconnect your hose, and put the cap on the tee. Remove the discharge from the filler neck and refill the system with coolant.
@carolinabeacher15585 жыл бұрын
i just did a head gasket and expansion plugs on a 4.0, i used my pressure washer to clean the block while i had the expansion plugs out, then lifted the heater core hoses and let vinegar sit in the elevated hoses for a about a day now, its completely clogged, i did the same to one of my jeeps a few years back that was just as clogged, it still works great, hope this one works out too. just wanted to leave a tip to help out for those who have the same problem.
@josephfine33945 жыл бұрын
Careful blowing full air pressure directly into heater core, it could crack...
@explicit_dynamics4 ай бұрын
How?
@bothomas84155 жыл бұрын
Don’t worry about clearing out the water, check this out. Let’s say your system holds 4 gallons of 50/50. What you do is pour 2 gallons of strait antifreeze in , then fill the rest up with water until it’s full. That way you know you got all the antifreeze in and it’s has a perfect 50/50 mix.
@ApartmentKing663 жыл бұрын
Except that if you've still got old crud-filled coolant in your system, the old will mix with the new and you'll be wasting both time and coolant. Besides, with water and coolant still in there to begin with, you won't be able to get all 4 gallons in and your balance won't be 50/50.
@ibberman2 жыл бұрын
@@ApartmentKing66 You only ad 2 gallons straight antifreeze.
@jonmo2694 Жыл бұрын
@@ibberman Yes, if he is confident he got it all out.Honestly, blowing air is a waste of time, he probably didn't even get more than a pint out .But hey I guess it's tap water, but that is nothing the concentrate can't take care of
@Maxxis19416 жыл бұрын
A hint to all for faster cooling: wrap the rad cap in a folded towel and put on leather winch gloves. Pop the cap to first click. It helps cool the engine faster. It opens the coolant to air and gives the coolant a proper place to vent the heat instead of slow dissipation to a closed system. Great vid Matt. 🤙
@petemcl994 жыл бұрын
After your test drive you do not need to remove the radiator cap just check the coolant recovery bottle. As you saw it sucked fresh coolant into the system. Working as designed. 👍🏼
@imoutofideasfornames6 жыл бұрын
Well, my heat works again. I’ll be thanking you all winter.
@keithh74837 жыл бұрын
Good video! When you flush the radiator take the heater core hoses off and the pressure from the hose will push all the old coolant from the engine block out of the heater core hoses. Then just flush the heater core.
@AntonioClaudioMichael Жыл бұрын
Great Informative Video
@lorenray94794 ай бұрын
One easy step X20? Lol I love learning unique and varied techniques!
@ARCSTREAMS4 жыл бұрын
how come there was no coolant in your core or hoses when you opened them? i thought there is always coolant trapped in the eng block and core because the thermo valve is closed
@valjean20363 жыл бұрын
Thats my thought to
@GleepGlop23 жыл бұрын
Yeee, thank you I was wondering about what to do about all of the hose water left inside from flushing!
@tonyisme49342 жыл бұрын
Target sells distilled water in very nice containers that won't break like the ones from the grocery stores I would get seven or eight jugs instead of using hose water. This is exactly what I did I got it at Target about eight jugs and it's cheap
@greglandis19986 жыл бұрын
Spot on! I followed this procedure for my 2004 Blazer v6; this flushed everything... THANK YOU!
@Tiktalkrandom7 жыл бұрын
CLR works like magic.
@RuhRohRaggee Жыл бұрын
Doesn’t the engine block have a coolant drain plug?
@lonnieritz96924 жыл бұрын
Love the Gatorade cap on the reservoir
@JeepingNet7 жыл бұрын
I'm also a big fan of adding rad flush a few days before. I've never done the flush this way I've always done the keep replacing with distilled water and pulled the thermo but I might give this a try on my new project. Nice video.
@james54605 жыл бұрын
Very helpful, that's the way to do a true coolant flush.
@deasttn5 жыл бұрын
2:15 I'm so glad that you said that you know it's sweet tasting from experience. I watched another flush video and about half the comments were from dolts asking how the guy knew that coolant was sweet tasting.
@mydick74297 жыл бұрын
EPA loves this guy.
@grayghost78474 жыл бұрын
🤫 no tagging please. 🙃😂
@albert-wg4cy6 жыл бұрын
when flushed and clean water still left in the engine simply use concentrate instead of 50/50 cuz air will not push all the water out think about it as soon as air will make room to pass over water it will do so and rest of the water will stay on the bottom of the block
@CapS19394 жыл бұрын
this is how the cooling system is washed all over the world. I also did on my cars. Just don't blow out the rest of the water. And so the video is cool.
@zeitGGeist6 жыл бұрын
this is the best video i've watched in a long time. I have a '94 thats getting a flush next week after I watch this a few more times. thanks!
@canadapainter6586 жыл бұрын
Do you think it is OK to drain a radiator after the car sitting for 4 months or do I need to start the car up to circulate the coolant in the engine and drain it. After that use flush with distilled water to flush the coolant system......
@lawjye41692 жыл бұрын
Do you really think you got into the engine block by going through the heating hoses?
@maniacalmonster22933 жыл бұрын
Thank you for that hard lesson learned so I know now to be careful not to drink my coolant 🤣
@jackslapp90733 жыл бұрын
Yeah, there are about 20 steps here, but it is a one time process rather than repeating a process multiple times. Thanks. Only one question. Can you also flush the water pump through it's in and out hoses?
@falseprophet19726 жыл бұрын
Keep the hose drenching the battery. priceless.
@armoricain6 жыл бұрын
LOL LOL LOL!!!
@sciewter5 жыл бұрын
I didn't know batteries dissolved in water.....
@XEatmorechicken5 жыл бұрын
@@sciewter exactly, if that was a problem, there would be a lot of "off road enthusiasts" that would be in bad shape
@Jason56B5 жыл бұрын
Scott Dunn nobody here said it does.
@jpatrick19675 жыл бұрын
Water does not conduct electricity. Do some fucking research.
@WeBleedGreen17 жыл бұрын
You can also point the vehicle up hill when filling and it'll push the air out. And start it and let it idle up to temp and refill. But having the cap on, it refill from the reservior like it's supposed to
@JamesMPogue5 жыл бұрын
A well presented utube video explaining proper procedures for flushing the cooling system.
@williammitchell19307 жыл бұрын
If you drain the radiator and leave drain open you can leave the garden hose in the radiator while the car is running and the water pump will push clean water through the system... cleans out all of the same components and saves time.
@Rsp7ccw6 жыл бұрын
hose water is bad in it
@badjer43286 жыл бұрын
Except the junk in the heater core
@tousshong94386 жыл бұрын
@@Rsp7ccw, true but after the tap water you rinse it with distill water then add proper coolants.
@mdf39116 жыл бұрын
William Mitchell p
@x-man50566 жыл бұрын
Make sure hose water pressure is low, petcock drains slow.
@hikerJohn7 жыл бұрын
Find the capacity of the coolant system and make sure you use half of that much concentrated coolant. You don't need to make any 50/50 unless you bought a half a gallon more than you needed and you want to keep it for topping off but Ive never needed to top mine off in two years so you might just be storing the 50/50 for years.
@bullsh31764 жыл бұрын
That found penny skit was hilarious! 😂😄 Great information! 💪 🤠👍
@jimdavidson52087 жыл бұрын
Prestone flush and fill kit. Much faster than running with water then draining it three times. Actually BACK FLUSHES your entire system and goes AROUND the thermostat. You did roughly the same thing.
@BehradJi5 жыл бұрын
I just flushed my peugeot 206 coolant system using your video tnx man good tips 👌🏻
@brossovitch6 жыл бұрын
Great video man. I'm newbie ZJ owner and I'm planning on doing a coolant flush when I replace my hoses and thermostat later today. You just made the process much easier for me. Thanks.
@oldchevymax17517 жыл бұрын
I go wheeling in the Mojave desert and Johnson Valley. Would have pulled the thermostat flushed without it and install a new thermostat. Can be a lot of work but with 120F out on the trail, I do everything I can to keep from having to walk out.
@ke6bnl5 жыл бұрын
might want to tell folks about your air hose disconnect, those are nice to have. I like to add the use of a air/water pressure flusher and a vacuum coolant filler to not have air pocket if you can justify there expense.
@dylancox83497 жыл бұрын
Gatorade top on the coolant reservoir LOL!!!!!! Issa Jeep haha
@bleepinjeep7 жыл бұрын
+Dylan Cox good catch! Lol
@southseapirate17 жыл бұрын
I once used a can of dip between res and PCM to hold the wires harness in. It actually worked great :D
@aolmemories7 жыл бұрын
Dylan Cox I have a gatorade cap too lol
@chadpugh14906 жыл бұрын
Gonna try that...
@stanswarts19396 жыл бұрын
Hey, where can I get some if that chicken water?
@aegixxer17 жыл бұрын
you can simply leave the cap off, turn the heater to hot and run it up to temp. once the thermostat opens, it'll burp out any remaining air. then add any needed coolant, cap it off, top off the reservoir and you're done. this only applies to open loop(non renix) systems and those that have the cap as the highest point.
@Lonewlf76767 жыл бұрын
I usually use a plastic funnel that is cut off to fit the radiator fill hole diameter and not bottom out on the core. I thereby make the filler the highest point with fluid in it and let it burp that way. There ARE some times on some engines I have to crack a provided bleeder valve, but overall it works nicely.
@Joian-l2lАй бұрын
My favourite channel.... Thanks.😊
@doc5597 жыл бұрын
I've heard of Water Wetter and Enginkool, but not CHICKEN 🐔🐓🐔 Soup coolant! Jeep victuals😀 THAT made my day. Thanks for posting 👍
@berkleywebster11157 жыл бұрын
Dr. Mark in Texas have you used water wetter? If so, was it effective?
@ThePr8head6 жыл бұрын
Great Video! I have used the chemical flushes before and killed my cooling system. I NEVER use them anymore! Got me an 83 CJ7 frankenjeep last summer and plan to make it my daily driver. It needs lots of loving to get there but it is worth it. Keep the great vids coming!!!
@heavymechanic26 жыл бұрын
I drain my coolant long before it gets "Nasty as Fuck" and refill it with fresh antifreeze, a water pump failure is a thing of the past.
@steveapplebaugh22005 жыл бұрын
Awesome job - I feel ready to flush my own truck's cooling system without taking it to a shop! Cool!
@N0N01115 жыл бұрын
Use HOAT (Hybrid Organic Acid Technology) coolant.
@jordanhorvath6753 жыл бұрын
Great vid very helpful but what if i dont have air hose to blow out the water .then what should i do.
@SerHuntsReviews7 жыл бұрын
please explain the chicken meat in you coolant.... lmao
@dg98adams4 жыл бұрын
Nice and easy and just when I needed.. changing the thermostat in my 94 YJ...and figured I'd drain the system and back flush the heater core and rad...
@bleepinjeep4 жыл бұрын
Excellent!
@x-man50566 жыл бұрын
Very good, comprehensive process. But never go under a vehicle to do anything w/o safety glasses. A speck of sand/dirt in eye is major pain. Don't know what coolant in eye is like but don't want to know either.
@joshhanneman4997 жыл бұрын
I always turn the vehicle around on the hill after filling then top it off, radiator cap at the highest point, helps to burp the system
@bf3and4highlights834 жыл бұрын
Day late and a dollar short but if you know you're going to do this swing by a local gas station/garage/napa/whatever and see if the have a used DEF container. These hold just over 2 gallons and are clearly marked on the side. Mixing is a breeze and because it is marked if I have a partial jug I know exactly what the 50/50 mix is.
@Sjhssucks7 жыл бұрын
You forgot to do the Safety Squint before dropping the coolant
@XEatmorechicken5 жыл бұрын
the only right way to drain a cooling system is to pull the lower hose. think of all the stuff you could do with the 2 minutes you save
@richardrasmussen80087 жыл бұрын
Great vid!!! Learned a couple thing I never thought of before
@amoncopeland67477 жыл бұрын
Painful but I didn't skip adds. Because I like you and this channel. Been away for a while but glad you have a zj project
@MrBeeboh6 жыл бұрын
I have a lot of Hot dog water (I use it when I go out cuz women love it) can this be used in an emergency?
@chuckychuck4 жыл бұрын
I just ran water in resevoir while engine was idling, that'll flush out your engine block. kept an eye on my temp gauge though she stay in the operating temp zone only screw off the small cap to the radiator so it drain out slowly
@sogyseal79627 жыл бұрын
On heavy equipment we use cascade dish washing detergent in powder form to clean out cooling systems after a component failure.
@kellysiefkas95953 жыл бұрын
Mix ratio?
@jordanbarnett14037 жыл бұрын
The cheap jeep videos are super helpful! I got a 94 black 5.2 zj as my second car so knowing how to do a budget lift and what problems I will run into is really great, by the end of the summer I will be doing a similar lift to the one you did (i.e the F2R spring swap, extended sway bar disconnects etc) and hopefully ill be able to fit 33's. Thanks for all the videos really helps out a kid like me learning how to work on my jeep XD
@ncognitod.4602 жыл бұрын
Love the vid - been a fan for yeeears! Just wish you did this with an XJ ....
@elpescadormiggz5 жыл бұрын
Thanks for the video. A Gatorade cap for the reservoir?
@rustyshackelford6742 Жыл бұрын
Or you can disconnect the upper radiator hose, and run the engine until the thermostat opens, while adding water in the process. That way you only remove one hose while flushing the entire system except the overflow which makes it two hoses. I believe it does a more thorough job with the water pumps help.
@andrewwhite73525 жыл бұрын
“You’re paying for water and wasting your money” *buys water*
@aedryk4 жыл бұрын
a gallon of distilled water is 75 cents. a gallon of water in premix antifreeze is about 5 dollars.
@williamgaines97844 жыл бұрын
50/50 mix $10/gal × 5 gal= $50. Concentrate $13/gal, distilled water $1/gal, so 3 gal concentrate + 3 gal water = $39+$3=$42. You have saved $8 and still have a gallon of 50/50 mix you have made remaining for future top offs.
@ionae.l7287 Жыл бұрын
Thanks a million brother. Very helpful tips.
@workshop_from_nothing7 жыл бұрын
over here in aus there's a product called CLR not intended for this but it works well i just dumped out the rad and stuck 4L in toped it with water ran it around the block to get if pushed around and properly up to temp parked it for the night took it round the block again and dumped it out with it hot went inside and got bucket of hot water from the laundry filled it up and drained it out a few times fair bit of dicken around but the junk that it removed was insane
@bananasoychoo7 жыл бұрын
Hey Matt, great channel, thanks a ton for all the useful info! Maybe a vacuum line video? Nobody thinks about that, eh?
@FromThe3PointLine3 жыл бұрын
This guy is cool, I liked the transmission video he did. Wish he did more junkyard videos
@fishrrelaxing93614 жыл бұрын
Not sure if this is going to be addressed at this point. But anytime your working on your cooking system make sure you rinse the entire engine bay down with water when done cause antifreeze will eat holes in your vehicle faster then driving it through a salt mine. It’s literally the worst possible thing to have sitting on metal components..
@jamesdecanteur4485 Жыл бұрын
I usually just run the engine with the petcock opened and a hose in the radiator cap so the water pump cycles everything through the system.
@cl0wnbird5 ай бұрын
you can extract air from the system by handpumping the top radiator hose with the cap off and the engine running after the thermostat has opened. essentially burping the system.
@jeff37417 жыл бұрын
I've never had chicken water but I have had hamburger water. The melted ice in the cooler was all that was available.
@jamesdean89147 жыл бұрын
Can you use this method on a 2014 rubicon? is there a in and an out on the heater core and if so does it matter which one you use?
@JesseCuster7 ай бұрын
Personally I LOVE the feel of coolant in my eyes. It's why I hang onto my Jeep. Never tried chicken coolant tho.
@Jon-ko3vv4 жыл бұрын
I like how you put the bucket under there but your recycling center is the hole next the to the barn
@funkydave1003 жыл бұрын
where did you get the platform for your winch i got same year jeep
@bleepinjeep3 жыл бұрын
Rough country
@mpikas6 жыл бұрын
The only thing you got wrong is that the coolant usually goes from the engine, into the heater core and returns into the water pump (or sometimes into the outlet side of the radiator which then returns to the water pump via the lower radiator hose). If you flushed it from the engine side you didn't back flush it like you said you should (which is the correct way to do it)