Overheating with AC on only
#1
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Year: 95
Model: Cherokee (XJ)
Engine: 4.0L
Overheating with AC on only
Long story short, my xj overheats when the AC is on only. Whe the ac is of temp hardly reaches 210 normaly 200. Outside temperature goes above 100 normaly and having the ac off is not an option. I have checked if electric fan runs while the ac is on and it does, actually the e fan is always on since it is conected direcly to the battery. I have put a new zj fan clutch and that is working great so Im not really sure if the e fan is blowing as strong as it should or if the condenser is making the rad hotter, already tried cleaning it but same problem.
#2
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Sounds like a radiator issue to me. ever replace the cap?
#4
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Year: 1990
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test the new cap.
#6
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Year: 1990
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NOT higher!! I think 13 is stock, but some folks use 16.
#7
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Year: 2000
Model: Cherokee (XJ)
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Have you checked that efan is blowing air into the engine compartment and not the other way around, as you mentioned it is connected directly to the battery and not the OEM wiring it could be incorrectly wired (happened to my brother once)
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#8
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#12
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Year: 1997
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An 18lb cap is too high. The higher the pressure, the hotter it will run. Switch to a 16lb radiator cap. Use a standard cap, not the ones with the lever on it. The only brands i trust are OEM or Stant (this includes thermostats). The only other things i can think of is the a/c seizing up a bit once engaged making the engine work harder, or the block needs a flush, or the gauge is off for whatever reason. Check the temp with a IR gun pointed at the thermostat housing to be sure its reading properly.
#13
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Year: 95
Model: Cherokee (XJ)
Engine: 4.0L
An 18lb cap is too high. The higher the pressure, the hotter it will run. Switch to a 16lb radiator cap. Use a standard cap, not the ones with the lever on it. The only brands i trust are OEM or Stant (this includes thermostats). The only other things i can think of is the a/c seizing up a bit once engaged making the engine work harder, or the block needs a flush, or the gauge is off for whatever reason. Check the temp with a IR gun pointed at the thermostat housing to be sure its reading properly.
Thoughts?
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