Originally Posted by
sorensenj
Not trying to be a smarty here Rockledge but does that mean the heater coolant valve is open with the control on the regular AC? Seems it should be off whenever your in AC or Max AC. Thanks.
Yea, it does seem a little odd that the hot water control valve only closes on MAX A/C, but that's how Ford designed it.
During normal A/C hot coolant still flows through the heater core, which means it's entirely up to the blend door to keep the warm air out of the airflow. That's why when a blend door door fails you only get hot air blowing out in all modes except for MAX A/C.