Vibration when A/C is on

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Jun 13, 2002 | 10:30 PM

dogboy

Thread Starter

Melting Slicks

Joined: May 2000

Posts: 2,305

Likes: 5

From: Orlando,Fl,USA

Vibration when A/C is on

Its a godawful vibration that can be heard inside the car also. The A4 was replaced last year and charged with r134a. It was always noisy. Its blows cold though but wtf is that noise & vibe. I'm sorry I didn't go with the sanden compressor. Oh yea I never pulled a vac on the line before the change over. It was open for awhile?

Jun 14, 2002 | 02:51 AM

Desertdawg

Race Director

Joined: Jun 2001

Posts: 16,483

Likes: 1

From: The Only Corvette in Gila Bend, Az.

St. Jude Donor '09

Re: Vibration when A/C is on (dogboy)

I get a buzz like vibration at certian RPM's. I figured it was normal, I havn't had any problems yet...

Jun 14, 2002 | 09:39 AM

77-4speed

Instructor

Joined: Jun 2002

Posts: 140

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From: Houston Tx

Re: Vibration when A/C is on (Desertdawg)

I don't know if you have your original clutch style fan, but I just replaced mine with a flex-lite fan. Well, now I get a vibration at about 900-1400 rpms when the A/C is on. Never happen before with the clutch fan. Oh well, I guess I'll just have to switch over to the dual electric fan setup :yesnod:

Russ

Jun 14, 2002 | 09:45 AM

kgraumann

Racer

Joined: Mar 2002

Posts: 369

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From: Nowhere

Re: Vibration when A/C is on (dogboy)

Quote:

Oh yea I never pulled a vac on the line before the change over. It was open for awhile?

I was always taught to pull a vac whenever the system was opened up. I don't know if that is causing the vibration, but it will create air pockets to where it won't cool at times.

Jun 14, 2002 | 06:21 PM

FeedVaal

Burning Brakes

Joined: Sep 2001

Posts: 1,166

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From: Tulsa Ok

Re: Vibration when A/C is on (kgraumann)

More likely water than air. Pulling vacuum is essential to elliminate the water vapor that enters an open system in humid conditions.

Jun 14, 2002 | 06:26 PM

vettesite

Burning Brakes

Joined: Aug 1999

Posts: 774

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From: Palatine IL

Re: Vibration when A/C is on (dogboy)

Compressor bracket tight and not cracked/broken? Correct belt tension? A/C clutch loose?

Jun 14, 2002 | 06:31 PM

Larry B.

Le Mans Master

Joined: Sep 2000

Posts: 5,635

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From: Orlando Floriduh

Re: Vibration when A/C is on (dogboy)

I do not know if this is your problem but a friend of mine's Camaro vibrated big time when the air was on... Turned out to be a bad plug wire and a broken motor mount.

[Modified by silvervetteman, 5:32 PM 6/14/2002]

Jun 14, 2002 | 10:58 PM

dogboy

Thread Starter

Melting Slicks

Joined: May 2000

Posts: 2,305

Likes: 5

From: Orlando,Fl,USA

Re: Vibration when A/C is on (silvervetteman)

New plug wires last year and motor mounts (2 1/2 years old). I didn't reinstall the bracket that goes from the compressor to the intake manifold? It seemed sturdy enough without it. Maybe I'll put it on and see what happens.