Squealing AC Compressor

[Junior]

My AC compressor squeals very loudly every now and then when i start it up early in the morning but if i turn the AC compressor on when im driving nothing happens should i be concerned about the squealing?

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[Rahul Jones]

It might just be the belt itself slipping. Check if the belt is worn and if it uses an automatic tensioner then check the tensioner too. If it has a manual tensioner then adjust the tensioner.

[Junior]

is it possible that the bearing on the ac compressor has gone bad?

[Rahul Jones]

Yes, even a bad bearing can cause noise. You might need to check the idler and/or tensioner pulley bearings too. At times the noise on these come when the further load like this AC compressor is added.

[Junior]

So i replaced the belt and sure enough the noise went away but now it feels like it’s running very rough and the AC light keeps blinking now. I feel like the belt has enough tension but now the light comes on. Since the AC compressor no longer squeals can i rule out a bearing? ( i have also been told that it might be the magnetic relay switch now) if all else fail i will just purchase a new AC compressor

[Rahul Jones]

When the AC light blinks does your AC Compressor Clutch disengage? If so, also check if there is power going to it while it disengages.

[Junior]

Yes it does disengage i dont know about the power thing? I also had a mechanic inspect the AC compressor today and he said it was running fine except he noted it might need a little more Refrigerant

One more thing we noticed today was that if i turn the AC on with the engine off it will squeal but if the engine is running and i turn it on it won’t squeal?

[Billy]

[quote=”juniortsf” post=201252]if i turn the AC on with the engine off it will squeal but if the engine is running and i turn it on it won’t squeal?[/quote]

If the engine is not running, it is impossible for the AC compressor to make any noise. Do you mean the HVAC blower in the dashboard?

[Author]

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