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how do i know if it's the thermostat, heater core, or blend door actuator? when defrost is on, floorboard is warm but dash top & front panels blow cold air.
after pushing 4-hi or 4-low button when at complete stop, put blazer in reverse and accelerate for a second, brake, and then shift into drive as normal and see if the indicator lights up properly . i had to do the opposite when mine wouldn't shift out of 4-hi or 4-low and it worked .