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Old 04-17-2006, 11:04 PM   #1
gaspig
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HVAC - Vaccuum Leak

My 93 Lumina switches air from the dash vents to the floor when I accelerate, regardless of what setting is on. Could this be caused by a vaccuum leak? I checked the HVAC module under the glove box and it seems alright. Any suggestions would be appreciated.
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Old 04-18-2006, 10:54 AM   #2
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Re: HVAC - Vaccuum Leak

I would bet it's a vacuum leak, or the vacuum canister under the hood is bad. Engines create less vacuum when you accelerate, so the vacuum canister is there to hold a reserve for low vacuum situations. Check the plastic lines running off the throttle body (theres a rubber piece with 3 or 4 lines coming off of it) for cracks or breaks.
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Old 04-23-2006, 11:09 PM   #3
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Re: HVAC - Vaccuum Leak

Both my '97 and my wife's '98 do this. I don't hear the telltale *hiss* of a vacuum leak in either car. This canister, is it a round plastic ball? I've seen lots of them in 80's GM cars. Where is the canister located in a 3.1L Lumina?
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Old 04-24-2006, 12:17 AM   #4
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Re: HVAC - Vaccuum Leak

Driver's side bumper, forward of the fenderwell. It probably broke either there, or the T connection with the check valve. You can trace the whole line starting at the top left of the plenum, facing the engine from the outside front.
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