94 sse climate control problem - 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 08-25-2004, 12:44 PM   #1
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Default 94 sse climate control problem

the only vent that works is the lower vents when the climate control says that is should be coming out the upper vents
and also defrosting vent works also when designated
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Old 08-25-2004, 12:48 PM   #2
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could possibly be the vaccuum lines next to the battery...
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Old 08-25-2004, 01:26 PM   #3
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Check the vac. hose located just to the left of the master cylinder as you face the engine. It runs between the intake manifold and the fire wall.
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Old 08-25-2004, 01:35 PM   #4
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And if that'* ok, check the vacuum manifold behind the climate control head unit.
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Old 08-25-2004, 01:38 PM   #5
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will wut does that look like??
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Old 08-25-2004, 01:46 PM   #6
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It'* behind the dash between the stereo and glove box. You may be able to access it from the passenger footwell if you remove the hushpanel. It'* a round plastic manifold with a bunch of vacuum tubes coming out of it. The ECC unit uses vacuum to actuate the valves and doors. You might have to follow all them around.

The advice to check the fittings on the vacuum manifold under the hood is good, too. It'* the little black box between your black maxifuse relay center cover and the windshield wiper motor. Black box that looks like the maxifuse center, or part of it. There are 3 or 4 vacuum fittings on it that are prone to breaking. You can see this manifold in my sig pic. Directly above the strut tower, and to the left of the WS wiper motor assembly. Little black plastic box.
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