1993 Bonnie HVAC groans - 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 06-08-2010, 07:33 PM   #1
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Default 1993 Bonnie HVAC groans

I have a 1993 Bonneville non */c and when I have the HVAC selected to the dash vents (not defrost vents or heat vents), a loud groaning/fart sound comes from under the dash under moderate to heavy acceleration. I am somewhat of a gearhead, and am almost certain this is a result of loss of manifold vacuum to the door actuator while the engine is under load. Is there a check valve or something similar with a high fail rate? Thx for the info guys!
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Old 06-09-2010, 08:08 AM   #2
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The vacuum canister in your year is on the firewall next to the wiper motor. The check valve is usually about 2" or so away from it. Check all the lines to it from the motor. It is common for them to degrade over time.
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Old 06-09-2010, 05:07 PM   #3
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I looked for the can around the wiper motor, but all there was was the vac booster. My car is 1 1993 SE n/a. Is there any other place it may be?
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