[WYLDCTZ]

So, I've started to encounter this problem now that I need to use my AC. If the AC is on when the car is off, and I start the car, something in the engine area squeals like crazy for about 30 seconds, and then goes away. I assume its the belt to the compressor or something?



If I let the car warm up and then turn the AC on, no squeal.



Thoughts?

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[rustech]

[quote name='WYLDCTZ' date='May 9 2005, 09:11 PM']So, I've started to encounter this problem now that I need to use my AC. If the AC is on when the car is off, and I start the car, something in the engine area squeals like crazy for about 30 seconds, and then goes away. I assume its the belt to the compressor or something?



If I let the car warm up and then turn the AC on, no squeal.



Thoughts?

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Cold belts don't have much grip and are stiffer than when belts are warmed up. When the A/C is engaged, the belt not only has to drive the pulley, but the entire compressor and so has more resistance to increasing RPM to idle speed (ie when engine first started).



Check to make sure belt is in ok condition, and of proper tension. It sounds like it is most likely just a bit too loose. I prefer to never start the vehicle with A/C engaged because I don't like the extra load on the motor at startup.

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[Cloud9...68]

I had the same thing happen on my car, though I had a more severe case of it, as it would squeal for about a minute after starting cold even without the AC engaged. Tightened the belt a bit, and the squeal is gone.

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[chazmink]

I had a belt squeal problem on start up on my last 968 and it turned out to be a worn alternator pulley. Eventually the belt snapped and I took a flat bed tow truck ride. Monitoring the voltmeter on the dash under different load conditions might give you an indication if the pulley is a concern.



Charlie

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[chuaed]

Resurrecting this old post relating to the a/c...

 

Been having a related issue in the recent week, when i have the a/c switch turned on, the belt starts to make a whining/clicking noise (like birds chirping) and vibration can be felt from the engine (resulting in door card rattlling a little).  With the switch off, the car behaves perfectly normal and is extremely stable with not the slightest vibration felt. 

 

What could be the problem?  Incorrect belt tension?  Or sign of an aging a/c compressor?

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[94SilverCab]

The "ears" on the condenser have been known to break off. If that is what has happened to you the unit will need to be replaced. Definitely sounds like more than a belt.

 

JMO,

 

Jay

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[flash]

it's actually the compressor, and not the condenser, but yes, they do get broken when somebody tries to tension the belt without first loosening both mounting bolts, and/or forgets to torque them back down when they are done.  very expensive lesson.

 

squealing is usually belt tension (which could be due to broken ears), but it could also be a seizing compressor.

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[jfrahm]

Stock belt tension as per the 9201 is very high for this belt, but if it's loose the alternator can also cause squeal.  Indeed the compressor might be getting stiff and/or there could be an alignment problem, often caused by poor quality work damaging the belt tension strut, mounting points, mounting bolts, etc.  It'd be good to check it over carefully before the AC pump falls out on the road.  Yes, this happens.  You need to check all the ears, bolts, strut, etc.

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[chuaed]

Im gonna have to spend some time checking on all of the above then. Hopefully it is an alignment issue rather than one that requires the compressor replaced.


Im hopeful to get this car running perfectly at some point.

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[apex]

re: 9201. I've had two belts go in the last two years, one alternator, the other PS. Both were tensioned to the - high - factory settings. I keep 'em kinda loose now. I'll get a little squeal on start when cold now and then but nothing too bad. One bitten, twice shy. I hate the flatbed. 

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