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Discussion Starter #1
Hey all,

First of all, I hope that you all Saab owners had a safe and very merry Christmas.

There's something which has been a tad annoying on my 1997 900S v6 especially since summer kicked in here in Australia.

Every time I turn the a/c unit on, there's a whirring sound coming from behind the dashboard and the sound revs up and down as the accelerator pedal is pressed down or released.

I was wondering if anyone had had this issue and if yes, what can I do to fix it? Is it a quick fix or would I need to take it to a mechanic\dealer?

Thanks a bunch
 

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Test and isolate by releasing the serpentine belt tension as the engine runs - maybe this is for the pros only ???
I'd do it.
Then, shut her down and grasp the pulleys and check for looseness or noise. Spin one, it should be tight and silent.
These idler and tensioner pulleys are good for 50K miles, but many last a lot longer.
You can also listed for noise using a stethoscope...Have the wife operate the AC as you listen.
Good luck:cheesy:
 

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I've got this sound going on in our NG. I've just accepted that it's probably the A/c compressor. As when I have the A/c fan on it whines. When I have the fan on but the compressor off theres no problem.
 

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I have this as well ever since I had my a/c compressor replaced with a used one. (other one's pulley bearing broke, long story)

If it's whirring with the a/c on but not off then your bearing is fine.

As for what's causing the whirring, I've heard 3 theories:

1) compressor is on its way out, replace stat (then again if thats the case then its held up for several months so far)
2) system low on freon (which seems unlikely cuz it was filled up by my indie right after he installed the compressor
3) compressor low on oil (also seems unlikely, its supposed to be a closed loop)
 

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Discussion Starter #5
Thanks for the suggestion

Test and isolate by releasing the serpentine belt tension as the engine runs - maybe this is for the pros only ???
I'd do it.
Then, shut her down and grasp the pulleys and check for looseness or noise. Spin one, it should be tight and silent.
These idler and tensioner pulleys are good for 50K miles, but many last a lot longer.
You can also listed for noise using a stethoscope...Have the wife operate the AC as you listen.
Good luck:cheesy:
Hi there,
Thanks for the suggestions. Unfortunately, I don't have the skills to do what you suggest unless I literally have a map to guide me through it. Come to think of it, I'll get myself a repair manual and take it from there.
In my case, it doesn't make any whirring sounds when only the fan is on; but as soon as I press that a/c button, it starts again.
I might get a local a/c specialist to have a look at the level of freon\gas and take it from there.
Thanks for the advice though.
Cheers
OzSaabOwner
 
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