1990Pioneer
NAXJA Forum User
- Location
- Denver, Colorado
Hello all, I have a 90' Cherokee XJ Pioneer, 4.0L I6, 5spd. The AC hasn't worked in a looooooong time. I finally decided to trouble shoot and fix it. I found that it is out of refrigerant (figured as much) so it hasn't operated due to low pressure. Anyways, I found and repaired a leak on the suction line service valve. Long story short, the AC now operates and cools wonderfully. Back to the issue, when I turn on the AC I noticed a sound coming from the engine. I found that the serpentine belt from roughly the alternator pulley up to the AC pulley is bouncing/vibrating pretty bad causing that "Loose belt Sound, not squealing, more like flapping ". It has never done this before until I added to load of the AC compressor to the equation. With out the AC compressor running it runs like a top and very quiet. I checked the tension on the serpentine belt and it seems to be just right. The belt itself is in good condition. All the pulleys are in good shape and spinning true and rigid. The belt appears to be loose in that area from the alternator up to the AC when the AC compressor is operating. ANY SUGGESTIONS WOULD BE GREATLY APPRECIATED! Thanks again my friends!
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