duct work problems - 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 09-29-2009, 08:12 PM   #1
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hey thanks guys for the help with the wheel hub. now im working on the duct work. the air only blows out the defrost and floor vents. im think its a vacume problem but im having trouble locating the vacume pod. am i on the right track? any sudgestions?
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Old 09-30-2009, 01:05 PM   #2
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See if this helps:

https://www.gmforum.com/t279092/

Come back and tell us if this helped or not. Good luck.
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Old 09-30-2009, 03:39 PM   #3
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The floor/defrost is a default setting when no vacuum is present to move the actuator.

The two common causes of this are the vac line from the manifold of the engine is disconnected or broken between the manifold and the vacuum canister (92-95 on firewall next to wiper motor, 96-99 under passenger front fender, 00+ unsure of location) or 96-99 the programmer nipples have collapsed.

The first is pretty straight forward and can be tested at the purple incoming hose at the HVAC programmer under the dashboard (96-99) and info on the second can be found by searching "Vents" by "James Tharp"
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Old 10-01-2009, 10:02 AM   #4
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thanks for the info. i printed it and will investigate the problem with my new found information. i will let you know how it goes.
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