Help with idle surge with heat or AC on??
#3
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Location: Texas
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Year: 2000
Model: Cherokee
Engine: 4.0
If you're running your defrost, the a/c compressor will cycle occasionally, just not as often as if you were running the actual a/c to cool down the cab on a hot summer day. This is the cause of that surging idle feeling (noticed especially when applying the brakes how it takes more force to slow the vehicle).
#4
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Year: 1998
Model: Cherokee
Engine: 4.0L HO
The a/c compressor will be engaged in any of the 5 vent selector positions circled in yellow......regardless of where the temp selector is set. If it's doing a rapid cycle on/off, could be low on refrigerant.
#6
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Year: 2000
Model: Cherokee
Engine: 4.0
Just a little FYI for anyone here that hasn't heard this before, the AC cycles on and off to remove moisture from the air before it gets pushed up to the window with the condensor coils. That makes it more effective at ridding your windshield of moisture. However, once the engine is warmed up, you really don't need the AC as the heat generated by the heater via the engine is usually more than sufficient to keep the window defogged.
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