Question about 2002 Chevrolet Blazer

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Heater problem My 1999 blazer does not give much heat. If I put the selector switch to the A/C mode and put the temp dial to hot I then get alot more heat. But when I use the heat settings the correct way I don't get much heat and it does not seem to blow out as much air as it used to. The heater core is not plugged at all. I am thinking this has something to do with the flaps or something not working correctly under the dash. Any help with this would be greatly appeciated. Yep, my 02 Blazer heater air doesn't get hot as it used to, definitely not ready for the Cleveland winter. Engine temps are fine, hits it's operating temp within the same time frame it used to, and steadies at around 190. Radiator hoses hot on the top, cool on the bottom. Fan blows fine at the various settings, diverts between defrost and heater settings fine. Don't think it's a t-stat issue, or a blower issue. Not sure what to do. Thought about replacing the heater/AC control panel, but it runs around $130. A bit much for a stab. I'm aware of a resistor within the set-up but I'm not sure exactly what it controls. It's only $25 but a devil to get to.

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  • rgraham278 Oct 21, 2008

    I have the same problem and it seems to be tied to the engines rpm new theromstat , new fan belt, the engine temp is running normal in its range.

  • jpdreamgirl1 Oct 21, 2008

    199 chevy blazer 4.3l not heat, checked water pump still no heat

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I had one of these at my shop recently and I fixed it by replacing the heater control panel. I went for the resistor first with a known good one and it didn't take care of it. I bought a new heater control panel and that took care of the problem.

Posted on Oct 21, 2008

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