Heater problems.. - 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 12-24-2003, 07:21 PM   #1
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Default Heater problems..

now that it'* cold outside i've noticed that my heater isn't working up to par.... sometimes it works..sometimes it just blows out cold air... ???? ..sometimes i'll start up the car and turn on the heater immediately and it will start to work...but then i'll start moving and then it just starts blowing out cold air again... help
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Old 12-24-2003, 11:02 PM   #2
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Default Re: Heater problems..

Quote:
Originally Posted by BonneAlien
now that it'* cold outside i've noticed that my heater isn't working up to par.... sometimes it works..sometimes it just blows out cold air... ???? ..sometimes i'll start up the car and turn on the heater immediately and it will start to work...but then i'll start moving and then it just starts blowing out cold air again... help
First off make sure that the EVAP Core isn't clogged (this allows proper air flow). Secondly make sure the T-Stat is a 195 degree for proper operating temperature. Thirdly make sure the coolant level is full & no leaks are present (air in the system causes less flow - therefore less HEAT). If any work has been performed on the cooling system lately, make sure the system has been "bled" of ALL air by using the vent valve on the top of the T-Stat housing. Also make sure the coolant is claen & of proper strength according to your climate (up here it'* -40 Celius).
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Old 12-25-2003, 01:54 AM   #3
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..another thing i noticed was that my temperature guage ( showing exterior temps) is flashing ...? what'* that mean?
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Old 12-25-2003, 12:59 PM   #4
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That'* what I was going to ask yesterday....

OK, you have to go to the dealer and have them retrieve the climate control codes for you. There is an internal problem with your system. Sounds like the air mix door from your symptoms.
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