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The heater blows but not warm air. Have put a thremostat in. But still no warm air

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johnni arai

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Check the coolant level, if thats full check the heater core

Posted on Feb 08, 2011


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I put a new heater core in my blazer and now the heater is blowing cold air why?

You need to verify that warm coolant is getting to the heater core by touching the hoses going into the firewall. If they are both the same temp or close, you might have a blend door actuator broken or sticking that does not direct warm air into cabin area

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Please press the Blue button to appraise my FREE Efforts, Thank You!
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