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Whistle at a/c compressor engagement


Psycho

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Hi

after I bought the next STS (99 20kmiles), I notice a short whistle, when the a/c compressor engages.

On my old 95STS I never heared that sound.

The whistle is realy short and is only heared, when the a/c compressor clutch engages.

After engagement, everything is fine.

I think this is not untypical, but I didn't had that on the old one.

And I sometimes get the B1324, so I will check the connector to the a/c pressure sensor.

Btw... a/c works fine.

But here are my questions: does that sound/short whistle appears at any other STS ?

Has anybode had problems with the pressure switch before ?

I did not find realy much about that.

regards Eckhard :-)

Ps. the 99 STS is my 4th US-car (I live in germany) and it won't be the last !!!

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Noises are very difficult to diagnose/troubleshoot over the web. Could you get a recording of the noise in a wav format? It might make it easier to describe.

Kevin
'93 Fleetwood Brougham
'05 Deville
'04 Deville
2013 Silverado Z71

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I defer to KHE, as he actually knows A/C.

My response was going to be that the A/C compressor operates off a clutch, so that the A/C pulley constantly spins, but the compressor is not constantly engaging. If you hear a sound immediately prior to the compressor engaging, it is likely to be caused by the A/C clutch mechanism.

Bruce

2016 Cadillac ATS-V gray/black

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o.k.

in other words.... I will check the clutch, but I think it is no realy big Deal.

The a/c works fine, but everytime the clutch closes, there is a short (about 100ms)

wistle, that I did not had on my 95STS.

If youre a/c clutch closes..... is there a short wistle ?

Regards Eckhard :-)

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Check your air gap, I don't recall what it should be but if its not within spec, it might be slipping due to excessive clearance. My clutch was chirping on engagement a few months back but stopped.

Pre-1995 - DTC codes OBD1  >>

1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm

How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/

Cadillac History & Specifications Year by Year  http://www.motorera.com/cadillac/index.htm

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Could it be a momentary squeel of the metal components engaging?

2008 BMW 328xi

2007 Chrysler Aspen

2001 Cadillac Seville STS

2000 Ford Ranger XLT
1998 Mitsubishi Spyder Convertible

1996 Saturn SC-1
1991 Ford F-150
1979 Chevrolet Caprice
1968 Ford LTD
1965 VW Beetle "Herbie The Love Bug Replica**

1961 VW Beetle

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I can rember a time. On older GM cars. You could get a AC clutch sqeall.

The trick back then was to rapidly cycle the AC on/off using the HVAC controls.

This would reface the AC clutch plates. Problem fixed.

Those systems were manual engagment...cant figure out a way to do it on the Cadillacs...

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My friends 99 STS made a sound like that when the AC engaged, I remember commenting on it to him.

Your 99 STS has a scroll type compressor that will sound different than your 95 STS did.

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  • 2 weeks later...
My friends 99 STS made a sound like that when the AC engaged, I remember commenting on it to him.

Your 99 STS has a scroll type compressor that will sound different than your 95 STS did.

o.k.

A/C works fine and the sound, when the clutch engages is still the same....

I don't worry about that.

Thanks to all :D

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