Question about 1999 Jeep Cherokee

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My AC is having trouble. It seems to only work once out of every 50 times I have tried to run it. I checked the freon with a AC gauge I bought and followed the instructions and it said the levels were up in the Warnings. But all my AC does is blow out hot air. Does this mean I have an issue with the compressor? or do I just need to add freon?

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Hi, first of all, you will want to verify that your compressor is kicking on. Open hood and located A/C compressor. Have a helper start the engine and and then turn on A/C to maximum with blower at full speed. See if you hear and observe the compressor kick on. The outer portion of the compressor outside the pulley is the clutch. It should make a click and begin to spin along with the pulley. If it kicks on ok, does your cooling fan at the radiator kick on also? May need to run the engine a few minutes to verify that. If so and you are reading a full charge at the low pressure port at this time, you have air in the system and it should be completely emptied and then re-filled with around 3 LBS of R134a refrigerant until you read a low pressure side of 45-50 PSI. Then you will be blowing cold air.
Please rate this answer! Thanks, Mike

Posted on Jun 14, 2011

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