A/C problem ... Airflow decreases under acceleration - 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.

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Old 06-24-2005, 11:04 PM   #1
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Default A/C problem ... Airflow decreases under acceleration

or when going up hill.

It also isnt cool at all !!!

Have had the compressor replaced, the system vacuumed, orfice tube replaced and system recharged.

A/C repair shop doesn't want to get into getting under the dash

HELP !!!!!!!!!!!!!!!!!! Car is too good otherwise to get rid of.
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Old 06-24-2005, 11:16 PM   #2
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Mine goes to defrost vents/floor if I'm climbing a hill or accelerating for a while. Loss of vacuum reserve allows the vents to default to the defrost/floor position. Can't remember if the temp mix door is or not.
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Old 06-25-2005, 12:08 AM   #3
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A vacuum leak might accentuate the problem; you could check the vacuum lines.
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Old 06-25-2005, 01:26 AM   #4
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not sure if it applies to our cars or not, but i know riding in other cars the a/c would briefly cut out {or go to lower vents like jwikoff said} under heavy acceleration or when climbing a steep hill so that the engine can get the power to do what it needs
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Old 06-25-2005, 09:06 AM   #5
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Default That particular problem never occurred before

I would tend to believe that it may be a vacuum problem, at least I hope so. I really don't feel like ripping the dash apart .

The decrease in airflow under acceleration or going up hill is NOT something that the car did from day 1, it is a recently occuring problem.

Other than the A/C problem and the possiblity that the sunroof drain tubes are clogged or disconnected and there is a slight leak into the passenger compartment and staining the headliner, the car is in really good shape with under 70,000 miles.

I would hate to have to get rid of the car, it really rides nice.
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Old 06-25-2005, 10:08 AM   #6
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Most likely you are losing vacuum and it is defaulting to defrost/floor. Can you check this and let us know. It will help with which steps you should take next.
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Old 06-25-2005, 01:10 PM   #7
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Default OK, where might I look for the vacuum canister

1996 Bonneville SLE

and anyone have any pics of it?

Oh and BTW n another thread about cleaning the Evap coil... Be careful... very, very Careful.... you may end up putting too much water in and it may go through the floor vents and soak your rugs...

It happened to me... Good thing I have a wet vac and its gonna be ninety today :(
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Old 06-25-2005, 08:01 PM   #8
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Haha----you didn't pay attention to the warning, did you?

Quote:
Originally Posted by Techinfo
Be careful not to allow too much water into the Heater Box, as this will cause it to overflow into the Interior Compartment & thus soak your carpet!
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Old 06-26-2005, 09:53 AM   #9
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Default I guess so....

But then I didn't read the article in techinfo
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Old 06-26-2005, 05:15 PM   #10
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Default Evap cleaning

i jsut did the evap cleanign and while cleanign i noticed on the can do not inhale vapors from this product they are harmful.... lol yeah thats why im putting it in my a/c vents lol. But i guess if u clean it out with the hose real good and let it dry it shouldn't be harmful. How many people did the cleanign and found a difference in airflow?
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Weird A/C Airflow Problem marquette97 1992-1999 12 08-19-2006 01:48 PM
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A/C airflow question tonyg 1992-1999 5 06-15-2004 02:02 PM
Low airflow from dash vents Brian95Blown 1992-1999 3 06-27-2003 02:42 PM


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