A/C vents wont change - 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 05-02-2004, 03:44 PM   #1
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Default A/C vents wont change

I have a '93 Bonne SE.(STOCK) (Changes are underway)

:( I went to turn on the A/C the other day and when I did I noticed the air was only coming out of the defoger vents on the dash and won't come out of the cabin vents no matter what. I have checked all appropriate fuses, and want to exhaust all possibilities before I take it into a shop. I was ok for the winter, but it is getting hot here in Pasadena, TX, and it is becoming an inconveneince.

Any suggestions will be of help. Thanks.
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Old 05-02-2004, 04:07 PM   #2
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Is there crud behind the cabin vents? Maybe take the dash off, stick a vacum hose down there and suck some stuff up
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Old 05-02-2004, 05:37 PM   #3
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I'm not sure if your '93 SE is the same as my '92 SSEi, but if it is, there are vacuum actuator valves for several of the air duct functions for the heater/AC If you remove the hush panel from the passenger side and look under, you should see a gang of vacuum tubing. The actuators look like little silver cans; make sure each can has a hose (or two) connected. My service manual shows the following color codes for the vacuum hoses: Orange: to outside air recirculate // Blue: to AC defrost // Yellow: to heater AC bi-level // Red: to heater AC bi-level // Black: to source vacuum // Violet: to source vacuum. The actuators are just little diaphragms that can tear over time. You may be able to isolate a bad actuator by comparing the effect of applying vacuum to each hose that is attached to an actuator. You can also check to see if the controller is supplying vacuum to each actuator hose as it should when the the controls are set in each vent position.

Hope this helps.
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Old 05-10-2004, 01:30 AM   #4
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Sounds like a vacuum leak. Check vacuum hoses from the throttle body to the firewall, then to the HVAC.
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Old 05-10-2004, 01:33 AM   #5
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had the same problem definitely check for vaccum leak
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Old 05-14-2004, 12:28 PM   #6
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Default a/c problem

Had same problem 93SSEI, was vacuum hose.
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Old 05-14-2004, 03:56 PM   #7
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A common hose to check is the one on the bottom of the black reservoir tank to the left of the brake master cylinder. I often knock that one off when I change my rear spark plugs or do womething else in the area.
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