2001 Jeep Grand Cherokee overheating

Tiny
LYNN53
  • MEMBER
  • 2001 JEEP GRAND CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 13,000 MILES
Ive had it for 12 yrs and it drives fine but when I turn on the AC it overheats when im stopped for a light I have put in a larger fan and checked the water pump and checked the fan relay switch what else would it be
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Wednesday, August 12th, 2015 AT 1:55 PM

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Tiny
CARADIODOC
  • EXPERT
You don't need a fan that's larger than the original, but more importantly, how did you fit that in there? Is the shroud missing? If it is, that will let the hot air go back around repeatedly through the radiator and get hotter and hotter.

Most of these had electric fans, and since you found a related relay, I assume that's what you have. Obviously check that the fan is turning on. If the fan is dead, the engine will not run hot at highway speed.

The next thing is to look at the cooling fins on the radiator. If they're corroded and crumble easily when you rub them, that will reduce their effectiveness at giving up the heat to the surrounding air. The additional clue will be both radiator hoses are real hot.

If the cooling fins are in good shape and not blocked with debris, look for the rubber seal under the leading edge of the hood. That has to make a seal on the core support to prevent air from bypassing the radiator. There also can't be any holes in the core support, for the same reason.
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Wednesday, August 12th, 2015 AT 7:31 PM
Tiny
LYNN53
  • MEMBER
It runs good it just happens when the AC is on not when im running the jeep with out the ac on and the fan I put on is a jeep fan just a little stronger one so thats all good
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Friday, August 14th, 2015 AT 8:03 AM

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