Air only comes out of vents at low RPM
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Car: 1992 Firebird Trans Am GTA
Engine: LS1
Transmission: T56
Air only comes out of vents at low RPM
I'm having trouble on where to start looking for this problem. Friday on my way home from work as I accelerated air stopped coming from the vents and instead started coming out the floor and defrost vents. When I slowed down (of course the RPMs going down) the air started coming back out the vents again. When I sped up (RPMs going up) the air stopped and again out the defrost and floor vents.
I'm pretty sure I have a vacuum problem, but doesn't this normally work the other way around? On another car I used to own (92 Grand Prix) air would only come out of the vents when the RPMs were high, which makes sense since there would be more vacuum.
Today it started to do that again but after a while corrected itself and stayed normal the rest of the drive.
Any ideas on what's going on?
Thanks for any advice. This site has been an invaluable resource and I've solved many issues I've had with my firebird with a simple search here. I can't express how awesome this site and the community are.
I'm pretty sure I have a vacuum problem, but doesn't this normally work the other way around? On another car I used to own (92 Grand Prix) air would only come out of the vents when the RPMs were high, which makes sense since there would be more vacuum.
Today it started to do that again but after a while corrected itself and stayed normal the rest of the drive.
Any ideas on what's going on?
Thanks for any advice. This site has been an invaluable resource and I've solved many issues I've had with my firebird with a simple search here. I can't express how awesome this site and the community are.
#3
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Join Date: Sep 2006
Location: Biloxi, MS
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Car: 1992 Firebird Trans Am GTA
Engine: LS1
Transmission: T56
Re: Air only comes out of vents at low RPM
Thanks for clarifying man. I'm thinking it's at the switch since I can hear a hissing noise from it. Figures this would happen in the heat of summer.
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