heater blowing cold and temp display flashing, + other prob - 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 12-04-2007, 05:36 PM   #1
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Default heater blowing cold and temp display flashing, + other prob

ok, so my buddy'* heater works for a sec then kicks off (still blows) and the digital temp display starts to flash (95 SSEI). we recently changed the pcm and the car runs great now but it'* doing this. any ideas? i'm thinking thermostat stuck and/or blocked?, the car needs head gaskets bad though. popped the rad cap off and the oil and coolant is mixing nicely, there were snotty beige globs in the water neck. i'm thinkin the Tstat is plugged up.

also he heard something about the intake plenum gasket failing on these cars possibly causing the coolant contamination??? the car does not over heat and runs well but the coolant is friggin scary lookin!, it'* the color and consistancy of a choclate milkshake!
it was just flushed about 9months ago.
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Old 12-04-2007, 08:00 PM   #2
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You have two issues here>
The coolant oil mixing is probably the lower intake mainfold gaskets.
The flashing ECC is probably the Airmix actuator or its needing calibration.

You now have some new terms to search on since I'm not 100% on the 95'*.
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