Brrr!!! Heat not working...any help? - 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 01-13-2004, 05:51 PM   #1
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Default Brrr!!! Heat not working...any help?

Well...I have a `96 SSEI and my heat does not blow cold, I have just replaced the heater core, Thermostat, AND the control unit(which I paid $198 for from gmpartsdirect.com) This has not fixed my problem...I know the heater core is working fine because the inlet and outlet hoses on the firewall are hot. The thermostat is fine as the car runs at correct operating temperature, and doesnt overheat. The coolant has been flushed and filled, so there has to be another issue...I know there is a cluster of vaccuum lines that run to a circuit board, could this be bad? and if so does anyone know what its called...anyone with any info for me would be a total savior ...I dont really wanna take the car in for service if I can fix it myself...Thanx for looking, Gary.
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Old 01-13-2004, 06:04 PM   #2
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Sounds like the air mix door is not opening? Check connections to mix door motor, inspect linkage. fuses ok?
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Old 01-13-2004, 06:08 PM   #3
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fuses cool...i will check the mix door motor..is this is whats powered by the vaccumm lines? thanx bro, Gary
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Old 01-13-2004, 06:20 PM   #4
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The pic I have is clear as mud, but you have to remove the lower air cover, its on the left side of the console?
Theres air inlet and an actuator for driver and one for passenger.

Do you have access to a code reader? the hvac system has a lot of codes to help troubleshoot.
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