Is your Jeep 4.0L still overheating? Here's why.

Just watch it. You'll be glad you did.

[@headachegarage941]

10 year dodge tech here, been dealing my 94 overheating after got the ac working. Never in a hundred years would i have thought to check this. You earned a sub today! God bless!

[@tacticalrepair]

I don't know everything about anything, but I do my best to share what I do know. Thanks, and be sure to comment, share, and otherwise participate in my other videos,!

[@cadenedwards9727]

I've got a 94 and we replaced everything on the cooling system and its still overheating and bubling in the reservoir

[@AlejandroP1980s]

@@cadenedwards9727 Dodge ram 1500 damn my 93 Dodge ram w350 extended cab short bed diesel Cummins no major issues motor doesn't overheat is good even when off road

[@laynesawyer1640]

i dont mean to be offtopic but does anyone know of a method to get back into an instagram account? I somehow lost the account password. I would appreciate any assistance you can offer me

[@kobeshepard9776]

@Layne Sawyer instablaster =)

[@Taydrum]

Not the reason my WJ 4.0 is overheating, but I'm really glad you posted this because I learned something new.

[@Mike__S]

I'll never forget the time I had a harmonic balancer come apart. It was on the beach @ Oregon inlet of all places. Didn't overheat until the pulley and belt came off. That was on a 93 XJ. Never got the name of the guy with the land rover that pulled me all the way to the ramp

[@Scablands_Scavenger]

Had one that overheated constantly, on a long road trip out of desperation we pulled the thermostat and resealed with gasket made from cereal box and lip balm and then re routed the rear window washer tube to the radiator and poked holes in it to mist the radiator so it would not over heat in traffic so bad, that same trip the drivers rear brake fell apart and ate up the drum we had to rebuild in parking lot... oh the memories.

[@MrTM-fg6zn]

Rear breaks for sure

[@adamrouse16]

You a good man for sharing this observation after such a long chase. Wow, never would have guessed.

[@rc9266]

Thanks for posting this i will check mine, Thing is making me crazy. I"m in S.Fla this morning just removed the t-stat and within 2 miles on the turnpike pissing H2O thru the new 18psi radiator cap, She has got new radiator 6mo I replace it, new h20 pump new, 7120 head, all done to factory spec. Ok HB is on the list as soon as she cools down! Will flush it again too, thanks

[@theoverlandingxj2368]

R C how you doing brother? Did you get your overheating problem fixed?

[@johnhealy4647]

Wow, just bought a 02 TJ (as is) and your describing what is going on (overheats at speed) make sense! Thank you...

[@clai-videos-and-reviews]

Was that the issue?

[@duster0066]

Way back when we were taught to check dampeners. Years go by and I never found a bad one. I don't remember all the timing issues I was having with a FE390, but I chased them around for a few days. I probably finally set TDC at the cylinder and walla! The timing marks were nowhere in sight. iirc I'm pretty sure what we were taught was to always replace the dampener at overhaul. Never reuse an old one on a good build.

[@BrettHoustonTube]

That's a great tip. I have tried everything else.

[@menarussell]

Thank youuu! I'll find out if that was replaced on mine. I don't think it ever was.

[@ModiconBob]

Wow! Good find!I have had old harmonic balancers fail that way on older Ford FE engines.....fortunately the belt pully is separate on those units.

[@Stalkerfiveo]

I NEED to check mine! Flushed the system and put in a new thermostat and the fan clutch is tight but I’m STILL getting hot at highway speeds, especially with the AC on. I have 260k miles and this makes total sense. Runs 220 without AC and 230+ with it on. Added load of the compressor probably just makes the balancer spin even more freely!

[@augustusanderson5662]

Wow who would of thought, been having temp issues, thanks

[@definitionmedia1130]

I'm having the same issues right now with my 02 Jeep Wrangler.done everything.il check the balancer and keep you posted.thanks for the vid cheers

[@clai-videos-and-reviews]

Was that the problem

[@willc3037]

Awesome sir! If this isn't my problem then I'm sure as hell going to make sure it isn't the next one!

[@twinturbo7234]

Air lock stops coolant from flowing. Coolant gets too low or after filling back up. Air pocket can bleed out at temperature sensor. Back of cylinder head driver side. Very small. Only do it cold. Tilt nose down hill. No air pocket , no overheating. Do not do it when hot.

[@robodrone4004]

The alternator looks new. The undiagnosed balancer might lead someone to change it when it’s actually okay.

[@Farmerbrad01]

2012 Jeep Wrangler changed all and everything been through 7 radiators still having problems, changed oil filter housing haven’t tried this yet but will tomorrow I’ve thought it might be but never tried thanks for info

[@sim7409]

wow I'm checkin this rite away we've done every other thing cld think of.

[@largelarry2126]

This is a good bit of info. I have one all apart and will look at this tomorrow.

[@thomastbucket2360]

great tip, never considered it. thanks

[@tylerc7336]

That's a good tip but you wouldn't just have a cooling problem, it wouldnt charge which I'm guessing is why there's a new alternator, and the power steering wouldnt be working

[@MoisesJha]

That's good to know. Thank you.

[@allenwatkins4972]

A bad harmonic balancer often ruins the serpentine belt by moving back and forth and running the edge of the belt into a bolt head on the block.

[@dalebailey1844]

thanks for that bit of info. HAVE A GREAT DAY!

[@laragreene8328]

MY 1995 STILL LOOKS GOOD......Ive had it most of its life....I'm saying they make parts cheaper in QUALITY the last 10-15yrs than they use to!!!

[@davidghost2913]

You nailed it.🤔👍💥💯 Thank you.

[@shoreguyeast]

Amazing! What a PITA!

[@mhmdnhad9012]

I have overheating issue I thing this what I missing thank you man

[@Xtinnoker]

Awesome catch, I bet that’s my problem... Thank You

[@bravesoulchannel1685]

Thank you sir. I appreciate you sharing your wisdom! Shalom-

[@officialWWM]

Lol, that’s what mine did. But it wasnt overheating before I replaced it. As soon as I replaced it, the overheating started 😂

[@Thestockxj96]

BEHEHEHEHEHEE

[@janerikschelander4406]

Damn that just explains so much about my Jeep heat issue😶 im gonna change that asap..

[@scrunchymacscruff1244]

gotta 87 wagoneer, and lots of other reasons for that heartbreak..closed radiator, capless, + 2 known pinhole radiator leaks..them gets you a air embolism and have to pull the sender out the head park on a hill and burp it, with coolant..need to fabricate special anti-frz dispenser out of 64-oz. soda bottle and skinny end tube so it fits in the tiny hole!!!!! After I'm replacing the radiator and fan-clutch, I'll see if I need to do this also. Thanks, never would have thought to check it! (Also, think I have a slightly blown gasket, but as long as we don't overheat, seems to work oaky.)

[@jovanyjimenez8187]

Hopefully this is the problem. This is my third time changing my water pump this month on my jeep. It leaking like crazy and I’m running out of ideas.

[@Amarillobymorning777]

Leaking from where ?

[@warrenwilliamson8507]

Thanx dude I'm checking myHB tomorrow ....subed!

[@Live-Life-Freely]

How do you go about checking it?

[@tombaja4.9]

Fan clutch test too.

[@tptrsn]

Incredible! Gonna check that.

[@freeridin12345]

i live in az and ive replaced thermostat water pump fan clutch condenser everything and even had 3 core csf in it finally put factory rad back in it chills at 204-206 and be over 100 out but then ac on it has heat creep real slow but when start movin it will go back down normally doesnt go over 219 and its a 01 with 335k on it original balancer lol

[@randybonner9870]

Got a 99 Cheap Cherokee . Tearing my hair out with the same kind of hearing problems . Gonna take my belt off soon as it's light and chk that tip out . I bet that's my problem . Thank you sir very much .

[@tacticalrepair]

Not a bad idea to replace it regardless. 24 years of use on a two piece rubber bonded pulley is pushing the envelope. It's not an " if" it'll fail, it's a " when".

[@randybonner9870]

@@tacticalrepair You're absolutely right. It's done it's job . Hard to complain about a part being 24yrs old but its time .Thx again . At least it a plausible idea when I am out of ideas .

[@randybonner9870]

@@tacticalrepair Sir , I need some advise on a Jeep if you can ? I have a 99 Jeep Cherokee sport 4.0 , 2 wh , dr, w/air , automatic. Issue is no heat and winter is coming . Heres what what I've done so far . First I had a blown head gasket , water in the oil and that . Fixed that . Tested new thermostat in boiling water , had a leaking heater core , fixed that , back flushed it and both hoses get hot now . The vents all open up when using the climate control . Still no heat . It seems like something isn't getting the message when I turn the knob from cold to hot ? Also the air conditioning works fine . When I turn the knob to cold for the air conditioning it gets the message . Ive got an 86 Prelude and it even has a simple component right on a heater hose that you can see it change from cold to hot , but not this Jeep . That'd make life too easy . I know this is a long-winded but I'm pulling my hair out and just wondering if you had any ideas of what to go look at next? I sincerely thank you for even considering. Good day sir

[@randybonner9870]

@@tacticalrepair Turns out it was the blend door unit. I do appreciate the tip on the harmonic balancer as I'll be changing it this month .

[@eggbone3061]

How do I fix it if I have the exact opposite issue? It runs cool while on the road but over heats sitting idle for roughly 20-30-ish mins. I have a 1996 Jeep Grand Cherokee Laredo

[@tacticalrepair]

Could be the fan clutch has gone bad, water pump is weak, or radiator has buildup inside so there's not enough heat transfer at low flow.

[@mikecoldsnow5464]

i think you just solved my problem. ty. just chnaged all coolant parts and still over heat .

[@angrywarriortacklebox42a32]

Mike Coldsnow .. I am going to check mine when I get home I have the front end torn off doing the second change of all my cooling system... am very curious if this might be my issue🤕

[@donalddday7741]

i did this on my old f150 4.9,was not running hot but got a vibration, had that truck 21 years and 540,000 miles before sold it

[@MUSICPARADISE01]

I have a 2004 Cherokee..New Radiator/Harmonic balancer/Pulley/ thermostat and water pump. FYI the 2004 has a metal balancer not a plastic innercore I replaced that based on what you said and it did not solve the problem. There is no water mixed with the oil the rsdiator and over fill is full of coolant so I don't know what the issue is! New fan too.

[@tacticalrepair]

You probably have a minor crack in the head or a very small headgasket leak from a cylinder to the cooling passages. Suggest getting yourself a headgasket leak detector kit.

[@mr.mcmagpie6606]

Ive got a 2000 XJ 4.0 and started to run at 220 and overflow in my reservoir after parking. Did a total flush, changed the thermostat and it still ran hot and bubbled over in the overflow. So assumed it was a headgasket but no coolant in oil or vice-versa. So replaced that and didnt see any crack in the head while doing it.... well, it still runs hot and bubbles up!! Any thoughts of whats wrong or where to start? Did I miss seeing a cracked head? Could it be a cracked block? Could it be the harmonic balancer youre talking about? Sick of throwing money at this thing

[@tacticalrepair]

The 2000- 01 are famous for cracked heads. Most probably that's the problem, but check your balancer too. Replace the thermostat if you haven't yet.

[@ColtRice17]

Been there done all of that still kept overheating turned out that the factory relay ground for the e fan isnt any good so a solid ground wire straight to the battery finally fixed it.

[@camcordernonsense5264]

Someone did the same to mine before I got it. Can't get that fan to work without it. Glad I saw your comment.

[@dadirtydawg7789]

Relay ground? Straight to battery? Im new to all this. Gonna google it after typing but still worth asking

[@anonymousbosch9265]

Life saver thanks

[@alfredocantu4554]

Thank you God bless you 🙏

[@georgemullin7772]

Great information this is awesome

[@John-zz5gt]

Thank you sir

[@saiburchowdhury2053]

Thanks man for the help

[@KentSlater]

yup commen issue but if your harmonic balancer is slipping you would have a lot more pressing issues like loss power steering, battery dying, no ac no fan

[@augustusanderson5662]

Make sure the fins on the water pump are not worn down, it can't push the coolant through!

[@jeffgzebb9533]

Kinda surprised that you weren't having charging issues.

[@autonomous_collective]

Wow....

[@garyclerkin4528]

Thank you buddy.

[@jedwardorr454]

Thanks fir the info

[@scottregan1667]

Thank you!!!!!

[@joselugo3203]

My 2003 Laredo just overheated at idle, coolant everywhere and it even popped the hood open. 225k

[@kanoandlupo3707]

Humm interesting I wonder if that's what's happening to my rock crawler

[@dr.trichome6419]

Electric fan with toggle switch stays wicked cold. 99 GC

[@camcordernonsense5264]

Does the harmonic balancer make a pretty bell sound when it's going? Mine does in idle and goes away after a bit. Thermostat was just changed but it's still hot. Mines a 2.5 from a TJ by the way. Thank you for the video.

[@jarvantheus8202]

Ggg

[@mikeray4578]

Good post! ( rare event but thanks for posting!)

[@johnedwards6939]

The belt drives the water pump which is connected to the fan. If you can’t see the fan not turning please sell the Jeep and buy a Prius.

[@tacticalrepair]

Agreed, however they can spin at idle but not under load. In this case the fan did still spin at idle but on the road it would run hot.

[@brucewayne-ej3cx]

Happened on my 94 Lexus gs300 at about 210k miles

[@menarussell]

My Jeep is 04, 4.0. I told the mechanic 210 means it's HOT. He thinks it's ok at 210 and up to 220 or so. NO! I know my Jeep! It gets to 210 sitting idle in parking lot lately which is abnormal. If it sits long enough it starts making a constant low noise (bad). So. I'm thinking it's the fan or something related. My dad told me replace thermostat yearly because it's cheap and they wear out. I'm going to buy one and request that.

[@torch4x4]

Mine overheats running for some time in highway at high speeds above 65MPH, even if motor is running at less than 2000 RPM, and when overheats water leaks from the antifreeze reservoir, once I go out of highway it goes back to normal, about 210, I was thinking to replace the cap, but it could be an issue this but still not sure why temp is normal at low speed city driving, with constant stops and high RPM and bad at high speed low RPM

[@patrickbutler7915]

I run fluid damper on my diesel engines

[@georgecurtis6463]

Mercedes had junk balancer that would mess up the engine when the rubber came loose back in the day. A real mess. We checked everyone that came in for signs of cracks.

[@snotellekS]

Mine does the opposite. Overheats at idle and with ac running

[@TheRealMikeWilly]

Same. I over heat when idling /crawlin, get up over 15 and it cools down in a jiffy. Water pump is 3 years old, flushed the cooling system and the 3 year old coolant coming out from water pump job looked absolutely beautiful, still bright green. Radiator is clear of any and all debris. I'm stuck?

[@scottdoubleyou563]

I had the same on my 2000 XJ. The culprit was the aux. cooling fan and temp. sensor. The fan would turn on, but wasn't moving as much air. New fan and sensor, and now it will not get above 208 degrees.

[@TheRealMikeWilly]

Changed my fan clutch after I heard my buddies 4.0, it was running and we had the hood open, I blipped the throttle a few times and I heard his fan spool up. Changed my fan clutch and now it doesn't overheat at idle unless it's been like 20+ minutes, electric fan still wont kick on unless I've got the middle knob in one of the ac modes tho🙄

[@gzalez9046]

Seems like there are a lot of different reasons why this happens, for me in my 04 GC Laredo it was a thermostat stuck shut... drove it around for 2wks in Texas heat blasting the heater to cool it down in traffic.

[@Vcoldduck]

I've done that and all else you've mentioned and still get backfire thru throttle body and over heats

[@tacticalrepair]

Email me and I'll see if I can help you more. [e-mail]

[@timstebbins3501]

Wow that would of been the bottom of the list for me I never would of have even thought of that amazing and to think I've been a mechanic 30plus yrs I've just never had that problem on another note how do you respond to the guy who said you didn't explain how to replace I can't

[@roberthall7206]

Why would a vehicle go to overheating and spilling coolant after idling for about 15 minutes??

[@tacticalrepair]

Stuck thermostat or blown headgasket.

[@hiscifi2986]

Looks like the rubber bonding has sheared on the Harmonic Balancer... Well spotted... Would super-glue fix it..?

[@tacticalrepair]

Absolutely not.

[@FLATUL8]

Sub’d. Thanks bud!

[@easyautorepairs6212]

It was helpful

[@alexcontreras9081]

I have the opposite problem. Engine runs at operating temp while drive but overheats on idle. Gave up trying to find the problem

[@tacticalrepair]

Your fan clutch is bad, or if you have one equipped, your electric auxiliary fan isn't functional. Fan motor or relay is bad.

[@keliwolland6586]

Would this also apply to a 5.2L V8 jeep engine? I'm very sorry if this is a dumb question but I am so not mechanically inclined.

[@hamadad1474]

🤟🤟🤟🤟🤟

[@SmittySpeaks]

I have the opposite problem. When the jeep sits idling, the temp gauge rises, but when I drive, the temp lowers from the air pushing against the grill. Any idea what that means?

[@tacticalrepair]

Your fan clutch is bad and/ or your electric auxiliary fan isn't working if your vehicle has one equipped.

[@SmittySpeaks]

@@tacticalrepair Thank you kindly!

[@davidchappelle6480]

Just got this 2001 Grand Cherokee from me neighbor.. I have flushed EVERYTHING an It will over heat even without the thermostat in it at idle ??

[@tacticalrepair]

Blown headgasket or cracked head, 100%

[@davidchappelle6480]

No oil in the water an no water in the oil an no steam comin out the exhaust..even did the exhaust gas test.. Still overheats???

[@tacticalrepair]

Did you change the radiator? If you did change the radiator, did you make sure to remove the shipping plugs from inside the hose necks? Other than that, has to be headgasket. How's the fan clutch feel? They're cheap. I usually replace them every few years for good measure.

[@davidchappelle6480]

Radiator an everything was new .. the only thing I haven't takin off is that New water pump.. thinkin Maybe he got a junk pump an the impeller came off.. tired of taking thus thang apart !

[@davidchappelle6480]

Couple days ago I ran the jeep around the yard.. it ran hot again.. found a tiny hole on the back side of the tube that goes from the water pump to the heater core.. got a new tube, already bought the new water pump an balancer.. took it apart AGAIN yesterday to put in new pump ,tube an balancer an some IDIOT forgot to plug in the electric fan 🤔 😁 .. got new everything in got too late to run it..

[@carlosg3670]

Hi bro , just saw your video good information, but I replaced the harmonic balancer on my yj jeep 1990 4.2 also did the timing chain and after that I have overheating what can be wrong?

[@tacticalrepair]

Is it still running good? Still powerful? You may have got the timing off, which will cause overheating. Or you may have blocked a coolant passage with a piece of gasket or silicone sealant.

[@carlosg3670]

@@tacticalrepair I’m pretty sure the timing is off because yj feeling like no power but start ok , by any chance do u have any idea what the distributor position has to be ? Thanks bro for ur help

[@mnstrxj3280]

Ok question would going to a lower thermostat work to stop overheating at idle (195-160) ? mine's an '89 4dr xj w/ a flowkooler waterpump ,mishimoto radataor & 3 fans setup + an oil cooler .

[@tacticalrepair]

No. If you have all that and you're still overheating, you either have some restricted cooling passages between the block and head, or you have a cracked head/warped head/ bad headgasket.

[@ironrupik]

How was the alternator able to charge the battery?

[@tacticalrepair]

@@ironrupik very poorly. I actually put an alternator on it before I found this because it was charging very weakly.

[@mondomikeg4921]

So where is the video on how to change the Harmonic Balancer? = )

[@tacticalrepair]

Never did one. Was just in a hurry trying to get that thing out of my shop.

[@ralphnabozny8494]

my guy put a new one on 15 years ago

[@stevenwood7131]

which years of jeeps have this problem?

[@tacticalrepair]

All of them. They're all getting close to 20 years old or more now.

[@timothybrown9178]

its not hard to change 1 parts hard to titen it. but im still overheating and my resivore not working

[@tacticalrepair]

Blown headgasket or cracked head then.

[@christalone0188]

Mine is overheating while idling but cools down while driving.

[@tacticalrepair]

Fan clutch is probably bad.

[@christalone0188]

@@tacticalrepair Thanks, I'll get that looked at.

[@keithgannon7546]

Anyone had this problem with jeep cherokee trailhawk ? Keeps overheating no one figure it out .. I would appreciate the help its been hell.

[@TheDiablo6661]

What’s the name of that part again?

[@tacticalrepair]

Harmonic balancer

[@MrTM-fg6zn]

Replace at 100k. Kaplunk.