Quote:
Originally Posted by mwpiper
Likewise, I suspect that the heater core is always hot because when I turn on the vent, the air is warmer than ambient. I can find no indication of a heater flow cutoff valve. Turning off the heat will require a valve, motor and switch, a little more involved than the A/C switch.
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+1 on the defog/defrost
I worked on a late model F-series that was like that. I think it is fairly common nowadays. They use a door to open/shut off the heater core to/from the rest of the box. Unfortunately, when the door motor goes bad, it is in a real fun place to get to.