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AC runs continious on defrost

Truckedup on Sun December 13, 2009 7:39 AM User is offline

Year: 1999
Make: Jeep
Model: Cherokee

The vehicle is a 1999 Jeep Cherokee,and I have two of these Jeeps.On one ,the AC runs on defrost all the time.It's my understanding the compressor should cut out below about 40 degreesF,correct? My other 99 Cherokee does work this way,ac on with defrost only when it's above about 40 degrees.
I suppose this won't really hurt anything but gas mileage.There must be a sensor located to detect the outside air temperature? I'm not an AC tech,but an experienced electrician that messes with cars. Thanks.

Chick on Sun December 13, 2009 8:47 PM User is offlineView users profile

They are designed to run with the AC on with defrost setting to keep the windshield clear of fogging up.. Outside temp isn't always the same as under the hood temps, so once the temp under the hood rises enough the compressor will come on.. Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

NickD on Mon December 14, 2009 6:11 AM User is offline

With so many different systems on the market all doing essentially the same thing, find it worth while to get a hold of a circuit diagram, alldata.com should be sufficient. Not good to run a compressor with very low pressures for lack of oil flow.

Truckedup on Mon December 14, 2009 5:47 PM User is offline

Quote
Not good to run a compressor with very low pressures for lack of oil flow. I ausme you mean low system pressure because of cold outside temp? I did pull the compressor fuse,I'll check the wiring layout on the site you mentioned.

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