Quote:
Originally Posted by 55blacktie
The Tbird has the same heater-box door. Fully opening the door will reduce hot air for the defroster.
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The heater box door was a "quick-heat" feature, but it does not matter, really. If the heater core is getting hot water from the engine, you will still get heat out of the heat register with the quick-heat door closed, but you can feel heat more abundantly with the door OPEN with your hand feeling the air coming out of the plenum (blower motor must be on if engine is idling in park).