[hawaii7]

Driving along, pressed the a/c button to cool it down a little and heard a god awful sound in the engine bay. Car shuddered like an impact.



A/c worked fine; pulled over and looked in the engine bay, everything seemed fine - no leaks.



Resumed driving, turned a/c on and off a few times, no problem. Had a nice late summer drive.



Any ideas?



Keith

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[DiREW0LF]

Has it been a while since you have used the A/C? Its possible the bearings in the compressor are going bad.

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[hawaii7]

[quote name='DiREW0LF' post='58761' date='Sep 1 2008, 05:01 PM']Has it been a while since you have used the A/C? Its possible the bearings in the compressor are going bad.[/quote]



no more than a week or so. runs quiet enough when on. I was thinking maybe the engagement clutch?

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[spectre996]

Mine did something similar awhile back. Awful sound and stutter when starting the AC for the first time each time I drove it. Mine turned out to simply be a broken compressor bolt.

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[DiREW0LF]

There will be some amount of shutter in the idle when the A/C is turned on but my experience a working system is that its not enough to shake the car. Has your A/C system been serviced in the past few years? A condition like that could also be a clog in the high pressure line coming out of the compressor.

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[Anchorman]

I would take the suggestion to check the compressor mounting bolts. They are known to fail, and you might have had some momentary misalignment of the compressor as the result of a failed bolt. If the bolts let the compressor go, you lose the belt, which is also the power steering belt, and driving becomes much less fun. I had this happen during a hot lap at Watkins Glen.

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[Kim]

My guess is the clutch. Just did this on mine and it wouldn't let go and fried the belt. Was a horrible screech as the belt spun on a non-turning pulley.

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[PorscheDude]

Thoroughly Check the bolts, as mentioned. If you turn on the AC with bolts improperly torqued, there is a potential to rip the mounting ears from the block.

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[hawaii7]

[quote name='smokiemon968' post='58774' date='Sep 2 2008, 04:38 AM']Thoroughly Check the bolts, as mentioned. If you turn on the AC with bolts improperly torqued, there is a potential to rip the mounting ears from the block.[/quote]





Great advice, I'll check it this afternoon. thanks!



Keith

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