A/C compressor "thump" - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 05-09-2004, 04:20 AM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2004
Location: Land of Lincoln
Posts: 1,107
Thanked 5 Times in 4 Posts
scottydl is on a distinguished road
Default A/C compressor "thump"

Tonight while driving my Bonny (highway, 55-65mph), I noticed a fairly loud thump coming from the front passenger area. At first I thought my passenger was stomping his foot on the floorboard... that'* what it sounded like. He swore he wasn't and said it seemed to be from the engine compartment. The thump repeated every minute or so, and stopped when I turned off the A/C... leading me to believe it was the compressor kicking on and off. But it didn't sound right. Any similar experiences, or ideas of what to check?
scottydl is offline   Reply With Quote
Old 05-09-2004, 01:17 PM   #2
Senior Member
Posts like a Corvette
 
Join Date: Jul 2003
Location: Ardmore, Oklahoma
Posts: 1,590
Thanks: 0
Thanked 0 Times in 0 Posts
big_boss2010 is on a distinguished road
Default

check the clutch on the ac compressor
big_boss2010 is offline   Reply With Quote
Old 05-10-2004, 01:03 AM   #3
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 3,392
Thanks: 0
Thanked 0 Times in 0 Posts
fuddyduddy121 is on a distinguished road
Default

Check to see what the compressor is doing when it thumps. All of them will make a click noise when cycling on and off.
fuddyduddy121 is offline   Reply With Quote
Old 05-10-2004, 01:53 AM   #4
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2004
Location: Land of Lincoln
Posts: 1,107
Thanked 5 Times in 4 Posts
scottydl is on a distinguished road
Default

Quote:
Originally Posted by fuddyduddy121
Check to see what the compressor is doing when it thumps. All of them will make a click noise when cycling on and off.
Will check... but this is definitely no 'click' as far as noises go. I thought my buddy was stomping his foot on the floor when I first heard it. Today I had the A/C on all day with no problems, and the other night I had it turned to "Max"... could there be a difference in compressor demand there, that would cause a problem?
scottydl is offline   Reply With Quote
Old 05-10-2004, 01:54 AM   #5
Senior Member
Posts like a Corvette
 
Join Date: Jul 2003
Location: Ardmore, Oklahoma
Posts: 1,590
Thanks: 0
Thanked 0 Times in 0 Posts
big_boss2010 is on a distinguished road
Default

i think there is a difference in compressor demand
big_boss2010 is offline   Reply With Quote
Old 05-10-2004, 02:08 PM   #6
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 3,392
Thanks: 0
Thanked 0 Times in 0 Posts
fuddyduddy121 is on a distinguished road
Default

The only thing MAX does is open up the recirculating air vents, so compressor demand should not change, unless the difference in air characteristics is freezing up your evaporator, or something like that.

Have you ever had the A/C charged or serviced before?
fuddyduddy121 is offline   Reply With Quote
Old 05-11-2004, 02:53 AM   #7
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2004
Location: Land of Lincoln
Posts: 1,107
Thanked 5 Times in 4 Posts
scottydl is on a distinguished road
Default

I have not had the A/C serviced yet. I just bought my SLE about 2 months ago, and didn't start regularly using the A/C until 1-2 weeks ago. I can live with the thumping if it'* not damaging anything... the air is still cold, and I have only heard the noise that one time. However if it is something that needs correction now, of course I'll consider that to avoid long-term problems.
scottydl is offline   Reply With Quote
Old 05-11-2004, 05:39 PM   #8
Senior Member
True Car Nut
 
Join Date: Sep 2002
Posts: 3,392
Thanks: 0
Thanked 0 Times in 0 Posts
fuddyduddy121 is on a distinguished road
Default

It might be something with the dampers... I've heard them thump before, but not every minute.
fuddyduddy121 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Thump from left rear kevinvinv 2000-2005 6 06-07-2009 08:02 PM
Odd thump under car JMH1950 1992-1999 7 09-23-2007 08:59 PM
Squeaky Rattle Thump Noise in rear... 93-SSE 1992-1999 2 09-12-2007 09:20 AM
Whine and no thump J Wikoff Audio (and aftermarket electronics) 6 08-19-2005 09:24 PM
Odd thump Sigma 1992-1999 14 03-13-2004 05:09 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 04:29 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.