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Old 01-24-2016, 12:36 AM   #1
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Default AC Clutch Grind

Hello everyone, I greatly need you guys assistance and suggestions.

Basically a couple months ago, my car used to make this grinding noise, the problem was intermittent. Now the problem came back in the winter and it hasn't faded away like before. I narrowed the problem to my AC clutch, I do not know if it is the whole clutch of just the bearing, I figured it was just easier to replace the whole clutch since it has the bearing included.

Also, a couple weeks ago when I would press the AC button, I would here it kick in. Just now I tried to test the AC to see if the clutch kicked in, the clutch would not engage.

What could be the problem of this? Could it be that the AC clutch is just in its entirely, going bad and causing it to not engage? Was it caused because I let the noise happen for a while now and it just eventually messed with the clutch?

Thank you guys, your advices are greatly appreciated!


2000 Grand Prix GT
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Old 01-24-2016, 12:42 AM   #2
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Old 01-24-2016, 12:55 AM   #3
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Start by checking the compressor'* clutch gap using a feeler gauge.
This link will help.
https://www.gmforum.com/mechanical-1...-plate-278951/
What is your gap size?
Also often the AC compressor will not engage until it is above 38 -40 F degrees outside.

Last edited by Soft Ride; 01-24-2016 at 12:58 AM. Reason: add temp info
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Old 01-24-2016, 12:57 AM   #4
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I do not know the gap size for sure but it looks normal, now my AC will not turn on ( I dont see the clutch engaging). Could it be because the clutch is just entirely bad? I dont wanna replace the clutch but in the end, my compressor is bad or something

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Start by checking the compressor'* clutch gap using a feeler gauge.
This link will help.
https://www.gmforum.com/mechanical-1...-plate-278951/
What is your gap size?
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Old 01-24-2016, 01:01 AM   #5
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I edited my post regrading temperature, is it above 38F outside?
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Old 01-24-2016, 01:02 AM   #6
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It is 25F right now, its cold. What does this have to do with anything?

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I edited my post regrading temperature, is it above 38F outside?
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Old 01-24-2016, 01:04 AM   #7
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The compressor is computerized controlled and to prevent freeze ups, it wont engage until it is above 38F.
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Old 01-24-2016, 01:06 AM   #8
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Omg that makes sense dude, it recently got cold in Georgia so its been below 35F lately, I just tried to start the AC and it would not engage dude. So how does it know the temperature? So I am guessing my AC system is still good and all I need to replace is the clutch?

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The compressor is computerized controlled and to prevent freeze ups, it wont engage until it is above 38F.
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Old 01-24-2016, 01:07 AM   #9
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Where can I also find that information?
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Old 01-24-2016, 01:13 AM   #10
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Car has sensors, info in FSM, factory service manual.
Measure the clutch gap to start with, it has to be specific, and will rattle if it is out of spec ..did you see the link I posted? I had to adjust mine.
Often rust build up between gap, I use emery cloth type sandpaper in between to get it cleaned up, and use a bit of silicone spray, keep it smooth & quiet.
You still may need to just replace the clutch & coil in there.
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