Question about 2004 Chevrolet TrailBlazer
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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