Heater's not workin - 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 04-08-2009, 12:35 AM   #1
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Default Heater'* not workin

once again i have one of several questions to ask you guys.

it was really cold today where i live, and i was drivin my bonne ssei and i turn on the heater and nothin but cold air comes out.

it used to work fine a year ago. i havent driven it since.

any suggestions guys?
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Old 04-08-2009, 01:45 AM   #2
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ill assume it was WARMED UP when you tried to turn it on

usually ive seen that sort of a problem result in being the heater core messing up
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Old 04-08-2009, 06:52 PM   #3
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Quote:
Originally Posted by 92BonneSSEi View Post
once again i have one of several questions to ask you guys.

it was really cold today where i live, and i was drivin my bonne ssei and i turn on the heater and nothin but cold air comes out.

it used to work fine a year ago. i havent driven it since.

any suggestions guys?
Check fluid level in radiator. It can be low and that leaves the heater core high and dry with an air bubble.

Or it could be the blend door in the heater box--stuck or actuator not working.
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Old 04-09-2009, 02:20 AM   #4
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Check the simple things first. I had this problem once, and it turned out that the only problem was that a vacuum line had pulled off of the connector on the engine side of the firewall. 5 second fix.

Open the hood, and trace the vacuum line from the top of the engine back to the firewall. All of the other lines should also be hooked up (power brake, etc.) as theoretically one of them being open would let in enough air to keep your baffles from moving in the heater section.

Just one possibility.

1994 stock 260k mi
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