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Air Conditioning Makes Grinding Noise, Shakes Entire Car

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Old 07-03-12, 07:14 AM   #1
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Exclamation Air Conditioning Makes Grinding Noise, Shakes Entire Car


I have a high-mileage (130K+) 2002 SC430. My air conditioning typically works well, but sometimes if I turn the AC on when engine is not warmed up, the AC causes the car to make an un-natural loud grinding noise and almost violently shakes the entire car.

If I start driving in this situation it does not seem to make a difference, the car continues to shake somewhat violently when in motion (along with the loud sound from the engine).

To remedy this, I turn the AC off, drive for a little bit, then turn it back on... and BINGO, the engine is as silent as ever (except for a faint squeaking sound which seems to be always present when AC is on, barely noticeable).

Being a convertible, I rarely turn the AC on, but when I do it blows cold as it should. I recently replaced both engine mounts and the transmission mount on this SC430, so I figure the car shouldn't be shaking so bad, something unnatural must be going on.

If anyone has any thoughts on what this could be I would very much appreciate it.
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Old 07-03-12, 10:09 AM   #2
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Is it a grinding or squealing noise (like a belt slipping)?
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Old 07-03-12, 10:19 AM   #3
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The primary issue is the grinding noise (almost sounds like an air compressor which is having a tough time keeping up with a load).

I also have a very faint squealing noise when the AC is on, but that has always been present and there are no other accompanying issues with the squealing noise.

Any help is appreciated,
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Old 07-03-12, 12:45 PM   #4
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Check Serpentine Belt , Tension pulley, air cond clutch .
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Old 07-03-12, 03:23 PM   #5
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I had a similar noise on my old GS400 with over 170,000 miles. I think it turned out to be the air compressor belt. Every time I would have the air conditioning on, with the A/C (air compressor) button on, I would have a similar noise, but then I would turn the air compressor off, with the air still blowing, the noise would go away. The air compressor is the thing that takes away the humidity and musty smell from the air being blown around the car.
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Old 07-03-12, 04:48 PM   #6
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check you belt mine did that noise when it was cold
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Old 07-03-12, 04:48 PM

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