Jeep TJ Overheating issues Explained

Common Jeep Tj issues seem to be overheating that's one of the many questions I get asked. In the video I discuss lots about overheating from coolant, having the radiator plugged with dirt or damaged to thermostat failures. Overheating can be the life and death of your Jeep TJ engine or any motor in that sense. keep ti cool

[charleshodge]

If you own a Jeep TJ I’d recommend using ONLY the MOPAR dealer radiator.

Believe it or not, some aftermarket radiators LOOK ok, ...they simply don’t cool as well. I know this from experience.

If you live in hot climate areas, I’d also recommend ventilation of the engine compartment via hood louvers/ vents.

The TJ (& 4.0 in-general) are also susceptible to “fuel-boil” at the injector fuel rail. There is a foil insulation blanket on top of the intake manifold that is SUPPOSED to block heat rising from the exhaust manifold below, ..but that blanket can become rotten, oil-saturated, etc.. which makes it ineffective.

[moabwheeling]

Great video Jerry . Hopefully that will help someone out if they are experiencing the dreaded overheating problem that a lot of 4.0 TJ 's experience. I for one have never had that problem (thank god ) however sometimes sitting at a light in the summer ( Utah ) my temp gauge will go from 210 to about 212 degrees. As soon as I start rolling again it goes back to 208 to 210 degrees. I'm adding a poison spyder hood vent this spring to help get rid of some of the under hood temps. Hope this helps ( don't see why it wouldn't ) with this . Take care !!

[GBV]

Hi Jerry, could you explain more about how to tell if your radiator cap is staying pressurised?

[mohammedjadallah]

I keep having overheating in my 03 jeep tj. I replaced the radiator thermostat water pump clutch fan head casket. I checked all the relay and its still overheated. I realized after i installed topfire style front grille i start to get overheat. I took it off, everything went back to normal. (It was not enough air flow to the radiator from the peice of crap i installed)

[BrettHoustonTube]

Thanks
What about having 3.07 gears with 32" tires?
Will that cause the engine to overheat

[KCoronaMars]

You mentioned running lean heating up your engine. My 2.5l has been back firing more than usual lately and overheating as well. What should I look for as the cause to running lean? Thanks!!

[michaeladams]

Have 98 wrangler 2.5, flushed heater core. Still no heat, when trying to circulate the coolant in order to burp the system. Noticed when throttle the engine, water level in rad only pulls down slightly, doesn't look like actually moving. Could this be the fins on water pump?

[osvaldo]

Mine likes to go slightly above 210 and I wanna keep it at 195 but can’t lmao, I’ve replaced radiator, condenser, thermostat/ and housing, water pump, tensioner, I’ve applied the prestige coolant flush twice flushed the coolant, and flushed the system with distilled water and 2 more coolant flushes. And nothing I mean it stays at 210 on the highway but overheats ones it’s still, so I’m barely gonna do the fan clutch
Now lmao

[outlander]

what on your thoughts and large temp fluctuations on a 4 liter?
mine will go to 210 then down to 180 back up and down 5 or 6 cycles until the motor has been ran for along time....then it seems to reach a homeostasis.

[popo_]

The louvered hood doesnt do dick for lowering coolant temps. Put one on my turbo LS TJ and it didnt drop temp but maybe a single degree.

[jonc]

New radiator, new clutch fan, new thermostat, new water pump, new pullies and belt. Everything was fine, but then i got my ac fixed(new condenser) and i overheat when stopped at idle randomly(doesnt happens all the time) while driving, its fine even with ac full blast. No idea what the deal is... any ideas?

[jonc]

I had a random overheat at idle... never happened again... any idea?😊

[jamesray]

Harmonic balancer worn out slipping also can cause over heating what about the floor getting very hot

[Graveltrucking]

You will have to have enough cooling system going with an engine that has aluminum heads, temps stay rock solid at 190-200. Not sure if Evans coolant would work or not.

[murphtahoe]

Great info! Are you going to upgrade to a Mishimoto aluminum radiator and change to an electric fan for your LS swap?

[joegonzalez]

97 jeep tj only runs hot on highway driving, any suggestions

[rabiebourchak]

Changed thermostat, radiator, new coolant ans still overheating any advice

[shansiddiqui]

Can you make a video on how to do a full coolant flush?

[IntradeMotors]

Hey off topic that rear parking sensor from the onehanglow factory on your ford is that still functional?

[danhambrick]

That LS will probably require more cooling capacity than that stock radiator can do...