jeepmontana

Have a 2000 Jeep Cherokee Sport w/ V6-
Put larger wheels and tires on and now it is overheating-
Daughter drives it to college at MSU so need to know is there any fix? Besides going back to stock tires!
Aftermarket radiator?

93_xjcherokee

That's your problem. Stop buying parts for a v6. Just kidding. Your jeep has the 4.0 inline 6. Not v. Start with a radiator flush and thermostat change.

sycoglitch

I'm going to agree and disagree here. Before doing any flushing or anything. How about we get more information. What size tires exactly. Lifted. Have you done any cooling system maintenance ever on the jeep. What about tranny fluid. Ever check that.

Also, is it overheating when driving or idling. An is it really overheating or is it just at the 210 mark. Does the electric fan kick on. Do you have a fan shroud in place. Time to start noggin pokin there on your jeep

Fred/N0AZZ

All of the above and depending on tire size you may need to re-gear the differentials to the proper gear and take the strain off of the engine and trans.


More information is needed to give a good answer but most would start with replacing the entire cooling systems radiator, water pump, fan clutch and a complete flush and clean of the block and heater core, a radiator is under a $100 at AutoZone.

Bugout4x4

My cooling system is proper and I have larger than stock tires on mine. I have to take it out of overdrive on the longer or steeper hills to bring up the RPMs and have the fan pull more air through the radiator or it runs warmer.

dcollins3208

I don't think tire size has anything to do with causing the engine to overheat, if anything oversized tires can cause the transmission to overheat. (I dd my rig on 33s and 3.55 gears and it hovers just at or under 210 in Texas heat)

What's your coolant level?
Fans functioning properly?
What does the oil on your dipstick look like? Milky or normal?

If all is good above;
Could be a bad thermostat. Feel the hose attached to your thermostat after your engine is warm BE CAREFUL it may be hot. If the hose is cool, there's your problem.
Could possibly be a bad water pump.
Could be a clogged radiator.
Thermostat IMO is most likely

If "stop leak" has ever been used, could be blocked coolant passages throughout the block, head, and coolant lines. I once worked on a friends car that used stop leak and EVERYTHING was caked with stop leak. It hardened in the passages in his head and coolant lines, kind of like a clogged artery, and wasn't allowing coolant to pass. Ever since I saw that I stress to everyone to never use that junk.

93_xjcherokee

Could be hoses too. If your hoses have been changed recently, sometimes new ones can collapse if they don't have the spring in them. Look at your radiator hoses when the engine is warm. If the hoses look collapsed, there's your problem