Air Conditioning only comes out of the defrost vents - Page 2 - 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 08-06-2005, 03:22 PM   #11
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Originally Posted by BillBoost37
On that fan speed. it should be whatever is selected. Sounds like the vents may be starting to work at a point, however I would believe they are not fully engaged. Meaning the airflow is being split three ways and seeming like you are getting less flow

I don 't know what vacuum guage to get

If you can hear any "hissing" down by your passenger side hush panel (or even better, from the HVAC box/connector with the hush panel removed) then the line connectors are pinched/collapsed and you need to do the "connector replacement with vac lines" part. This was my problem and I never did check vacuum at source/tank/or along the path to the interior. If you don't hear hissing, then you need to pick up a vac guage (ask them at the auto parts store what to get) and begin tracing at the source, off of the engine, to the resavoir tank, back to the Y connector, then into the interior.

Good luck and let us know how you are doing!
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