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Old 15 Dec 2010, 09:46 pm
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Default What can I do to alleviate the squeaking of my A/C belt in my 1991 Honda Accord?

My compressor has been replaced. I have taken it to my mechanic and he, as well as others in the shop, confirm that there are no leaks and it is holding coolant. But ever since replacing it I get a chirp when I start the car and when it is cold (under 20 degrees) the squeak persists even longer. It also squeaks when I accelerate or decelerate. I'm told that the compressor is just stiff and it should go away. But it has been a couple weeks and it still does this especially when cold. As I drive the car it does it much less. After driving for about 20 minutes or more it stops entirely. Regardless I feel there has to be a way to alleviate the issue. I figured either some belt dressing on the belt or possibly some machine oil in the compressor. Suggestions would be helpful, thanks.

Kudos on the using your compressor suggestion. It hadn't occurred to me that may help it unstiffen. Obviously not being in use due to it being very cold out I'm sure that contributes. Also kudos on the identifying of the proper belt. I'm sure you're right and that it is under tensioned. I will call my mechanic and have him adjust that. Can you over tighten a belt? It makes sense its the tension (actual tensioner part is fine according to my mechanic) since over time using the vehicle would only stretch the belt to one point to another hence the increased squeaking over the last week or two. Thanks guys.
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Old 15 Dec 2010, 10:01 pm
Join Date: Oct 2007
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Belt dressing should help but I wouldn't put any machine oil in that compressor.
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Old 15 Dec 2010, 10:16 pm
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try a new belt or maybe the belt tensoner needs to be replaced
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Old 15 Dec 2010, 10:31 pm
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Posts: 343

Not really much you can do just accept try the dressing, check that the belts tension is set according to factory specs , check all the pulleys be sure none are loose or warped, be sure the belt isn't worn out or damaged and perhaps try using another belt or try using the compressor more to brake it in faster.

Hope that helps and best of luck.
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Old 15 Dec 2010, 10:46 pm
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That's not the A/C belt, which is under no load at 20 degrees because the compressor won't engage when the ambient temperature is that low - it is the alternator belt. That is the only one that is under load at start-up. The alternator belt was removed to get to the A/C compressor and the belt is worse off for it.

There is a distinct possibility the alternator belt is too loose. Flat belts are hard to tension properly, especially if the mechanic goes by the rule of thumb for belt deflection for V-belts. I bought a flat belt tension gauge from NAPA a few months ago and found out I had been undertensioning the belts by at least 50%. I have also had good results with a squirt-on belt dressing available at NAPA - see the first source. Follow directions.

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