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.

A/C Problems

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Old 07-16-2010, 11:36 AM
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Default A/C Problems

First and foremost, I only get air out of the floor and defrost vents(and a small air flow out of the one in the center panel, towards the backseat). It'* been way too hot/rainy lately for me to poke around like I've been reading about, plus I don't have access to any jacks or stands, other than the carjack for changing the tire. I believe my issue has to do with something being unplugged or a door being closed, because the electronic system says air is coming out of the front vents, but it isn't.

However, starting yesterday I get an intense vibration in the pedals when the air is running. Turn it off, vibration stops. Ideas?
Old 07-16-2010, 01:03 PM
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On the vent location of flow. Start by checking the vacuum line that hooks to the motor at the back of the manifold. Easy way to find it is to follow the hose from the brake booster to the engine. It'* on the same fitting that hooks to the engine. If it'* not that, then it'* likely the HVAC programmer nipples being collapsed. Some vacuum line and you could fix this up quick.

Vibration... Motor mount? You don't give us a lot to go on for the diagnosis.
Old 07-16-2010, 02:54 PM
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Vibration, you know as much as I know at the moment...air on, I feel the vibration in the pedals. Air off, I don't feel a vibration.
Old 07-16-2010, 07:41 PM
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Maybe the blower fan is off balance. It is secured to the firewall just like the brake pedal is.

HVAC, I'm with Bill on this one. Check for collapsed lines behind the controller.
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Old 07-17-2010, 02:12 AM
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With my year, I have to jack the car up to get to those lines, right?
Old 07-17-2010, 07:12 AM
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No sir. All of your lines are behind the dash board. I believe they are all accessible through the glove box and behind the climate control head. I know we had a write up around here somewhere....
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Old 07-17-2010, 10:49 AM
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A link to a writeup would be great...having a hard time right now.
Old 07-17-2010, 01:35 PM
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Okay, removed glovebox only to find out I didn't need to, lol.

Stuck at the round thing, where all the colored lines plug into..how do I get that down to where I can see if nipples are broken?
Old 07-24-2010, 10:52 AM
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Still wanting to find out how to get the round thing the lines connect to off. It'* the piece right below the dash.
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