ngotham93nd Posted August 25, 2015 Report Share Posted August 25, 2015 Have a squeak that I thought was with the A/C compressor or pulley. I changed all the belts, pulleys and tensioners 25months/10000 miles ago. I changed the black pulley..no change. Today I changed the bearing in the compressor to no avail. The clutch looked smooth and operates well...I guess.When idling there is an intermittent squeak/squeal that sounds like a loose belt but the belts are tight. When turning on the A/C and idling, the noise is constant. When I punch the gas it goes away. When sitting at a light I can hear it. The A/C is cold and whatever is making the noise it doesn't effect the cold air output.Not sure what else to change except the other bearing in the pulley driving everything.I am open to any and all suggestions and thanks for your responses. Link to comment Share on other sites More sharing options...
TEEKAY Posted August 25, 2015 Report Share Posted August 25, 2015 Been diagnosing my belt this last week. I ripped all this info off of youtube videos. Spray one of the pulleys with some water and report back what happens. Do this with the a/c load on. If it goes away you can probably eliminate bearings as the culprit and that puts the noise on misalignment of the belt somewhere or tension on the belt is off. If the noise is the same it's probably a bearing. If the noise gets louder it's probably a tension issue or a bad belt. Link to comment Share on other sites More sharing options...
NEU Posted August 25, 2015 Report Share Posted August 25, 2015 I had a bad alternator bearing that sounded like it was coming from the powersteering pump. Before the alternator finally gave up, but I had replaced the powersteering pump, the serpentine idler pulley before it finally gave up. Are you 100% sure it's the AC? Link to comment Share on other sites More sharing options...
Colingold Posted August 27, 2015 Report Share Posted August 27, 2015 I had a similar problem, racked my brain trying to figure out where the noise was coming from. Auxillary and timming belt had less than 10k since changed. New tensioner and pulley too. Gave up and took to dealer. Found out that the previous volvo mechanic who did the work forgot to put the nut on the crank shaft pulley. OOPS! Could have been disastrous. Only thing holding the timing belt in place was tension. Make sure yours is there too! Link to comment Share on other sites More sharing options...
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