Question about Chevrolet Blazer

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The heater core is going bad in my blazer, but it still blows hot air. When I turn the control to switch the heat from vent to defrost or floor, it still blows out of the vent. How do I fix this?

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When your heater core is bad it smells sweet and sticky. Replace withe vacuum control SW in the dash

Posted on Jun 07, 2014

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THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE LEAK BEHIND DASH

Posted on Apr 06, 2011

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1 Answer

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Just got heater core replaced and now have no heat from heater or defrost. Fans work, just don't blow anything beyond "cool". The heat in my car is coming and going. I want to know how to fix...


It sounds like when they replaced your heater core, that they didn't properly hook up the blend door contros at the control panel. I would take it back to the repair shop that did the work and have them go back over things again just to make sure.

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