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Engine RPM & Compressor

ghiotom on Sun July 06, 2008 2:27 PM User is offline

Year: 1996
Make: Jeep
Model: Grand Cherokee
Engine Size: 5.2 L
Refrigerant Type: R134a
Ambient Temp: 90-95
Pressure Low: 30
Pressure High: 210
Country of Origin: United States

When the engine is at idle (500 RPM), my center vent temp is around 40, but if I accelerate the engine to around 1500 RPM it cools down another couple of degrees and then the compressor will cycle which I assume is normal. Now, I have an electric condenser fan and I'm doing this in the garage, so it's not a matter of increased air flow over the condenser. Is this normal or is my compressor weak and the increased engine RPM increases the speed of the compressor making it work better? I'm pretty happy with the AC performance, but I'm unsure if the compressor spinning a little faster should make much of a difference.

Chick on Sun July 06, 2008 5:51 PM User is offlineView users profile

If you're at 90 degrees and getting 40 degree vent temp, I'd leave it alone. It will cool down more as you drive, raise idle etc, but the cycling switch will shut the compressor off when it nears the freezing point. If it didn't, the water on the evap would turn to a block of ice and you would have no cooling inside the car..Sounds like it's working just fine.. But, you could be a little low on charge, and the only way to tell is to recover and weigh it, and if you're getting those vent temps at that ambient temp, leave it alone and enjoy it...
Hope this helps,,

Email: Chick


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