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A/C moanin' and groanin'

GrampS10Acious on Tue August 18, 2009 9:52 AM User is offline

Year: 1992
Make: Chevy
Model: S-10
Engine Size: 2.8L
Refrigerant Type: 134A
Country of Origin: United States

My brand new pancake compressor is making a moaning noise when it is running. It has been professionally installed and I was told to have it flushed and a 500 micron vacuum pulled on it. Is that the problem or am I barking up the wrong tree, so to speak?
I must say that it was not doing it after installation last year. Thank you for any help on this problem

JACK ADAMS on Tue August 18, 2009 11:37 AM User is offline

Oh no, how may time have we heard this! Can you tell us what all has been replaced? What was wrong with the last compressor that that you replaced this one with? Here is a link of what should be done when replacing a compressor: AMA Compressor Warranty

HECAT on Tue August 18, 2009 12:13 PM User is offline

Quote
Originally posted by: GrampS10Acious
My brand new pancake compressor is making a moaning noise when it is running. It has been professionally installed and I was told to have it flushed and a 500 micron vacuum pulled on it. Is that the problem or am I barking up the wrong tree, so to speak?

If you are saying you did not clean up from previous failure and vacuum system; then I agree you are barking up the right tree.

If it the compressor was professionally installed, and then you were told to do this before recharging yourself, and you failed to follow such instructions; bark at self.

If it was professionally installed and they failed to follow such recommendations common to the warranty statements from almost all compressor mfg/suppliers; bark at them (and maybe rethink who you consider professional).

It is common to want to blame the compressor as defective.

Based upon my years of compressor failure analysis, including return rates and data from many of my industry contacts (OE, manufacturing, remanufacturing, importers, supply chain, etc.); I would estimate the odds are about 30 to 1, that compressors are failing much more from improper installation issues over true product defects.


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HECAT: www.hecatinc.com You support the Forum when you consider www.ackits.com for your a/c parts.

FLUSHING TECHNICAL PAPER vs2.pdf 

GM Tech on Tue August 18, 2009 2:04 PM User is offline

Moans/ groans/or buzz- are usually signs of a loose mounting bolt- or sheared off mounting bolt-- Those steel horseshoe brackets that mount to the engine- can have loose bollts. Have seen some so bad you can't read engine oil on the dipstick-- check the bracket that the compressor mounts to-- is it secure to front of engine block?

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Edited: Tue August 18, 2009 at 3:58 PM by GM Tech

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