2004 Envoy a/c whine - AC Auto Repair Help Forum


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2004 Envoy a/c whine

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twinchester
New User

May 8, 2009, 6:21 AM

Post #1 of 3 (2352 views)

2004 Envoy a/c whine	Sign In

My 2004 GMC Envoy-6cy-4 wheel drive makes a loud whining sound when the air conditioner is off. It quiets down when I turn the air conditioner on. With the exception of the whine the a/c is nice and cold and appears to be working fine. Any ideas??

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 8, 2009, 7:06 AM

Post #2 of 3 (2351 views)

Re: 2004 Envoy a/c whine	Sign In

It sounds like you may have a bad pulley bearing in the compressor. Although it can be changed separately from the compressor, it requires specialized knowledge and some special tools to install it. We generally replace the compressor in that situation.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

May 9, 2009, 5:12 AM

Post #3 of 3 (2338 views)

Re: 2004 Envoy a/c whine	Sign In

To add: I don't know what specific compressor & clutch is used on this but a bearing (doable as Hammer said) may be difficult and especially is the type that's "peened" in I worry about redoing that.

If this has gone on long enough there may be other damage and surprisingly the cost of a whole compressor job on a working system may not be so bad vs some risk with attempting bearing only or new clutch w bearing.

Suggestion: This can't wait! If that bearing failed completely the belt would fly off and possibly cause a LOT of damage plus it leaves you stranded!

For now I would run the A/C full blast (open windows to warm up as needed) even if the next trip is to get this fixed as the bearing is "static" while compressor is engaged meaning it's NOT in use. Allow a shop to decide the best fix based on any damage now and the type of bearing and how it's installed,

T

PS: If going for the compressor in whole consider new vs rebuilt - sometimes price differential isn't the bad

(This post was edited by Tom Greenleaf on May 9, 2009, 5:19 AM)

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