Question about 2004 Chevrolet TrailBlazer

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My 2004 Blazer is running fine, and all the gauges appear normal as far as temperature. However, there is no heat coming out of any of the vents. I have moved the knobs around to try to "reboot", but the car has virtually no heat. Any suggestions?

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When engine is warm try touching the coolant line to your heater core under the hood pass side
if they are both hot coolant is flowing true and heater core should be o.k.
if not have it reversed flush
if o.k the a/c to heat door may be stuck not allowing air from heater core in or actuator to that
door has malfunction

Posted on Apr 02, 2011

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Posted on Jan 02, 2017

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