1994 Chevy Lumina AC air flow

MANDO8188

MEMBER
1994 CHEVROLET LUMINA
6 CYL
FWD
AUTOMATIC
245,000 MILES

When ever I accelerate the air flow from the vents stop and when I de-accelerate it starts flowing normal again?

Sunday, October 5th, 2008 AT 11:57 PM

2 Replies

JACOBANDNICKOLAS

MECHANIC
109,885 POSTS

Hi:

It sounds like there is a vacuum leak somewhere behind the dash. If you can, look at the switch assembly and follow the vac lines checking for leaks.

Joe

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Tuesday, October 14th, 2008 AT 10:44 AM

BYMY2

MEMBER
2 POSTS

I had same problem in my 1996 Lumina - it was a vacuum leak at the line to the vacuum chamber that supplies vacuum to the passenger compartment airflow positioning valves, when vacuum supply is low during acceleration, that got crushed when battery was replaced. The vacuum chamber is a hollow ball mounted inside the left front fender and the line runs right under the battery.

If you noticed this after battery replaced or any work done around the inside of left front fender, check it out. It's a lot easier than tracing the lines behind the dash.

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Tuesday, October 28th, 2008 AT 8:48 PM