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Heating system blows cold air.

(1999 Ford Windstar)
in Mustang, OK on October 26, 2010
I've never run into this one before. The vehicle has a two zone heating system with separate controls for rear passenger area. When the heating system is engaged, it blows nothing but cold air from the front console/floor air vents and windshield defroster vents. However, the passenger area is getting nice warm air. I suspect that the cable from the temp control on the front console may either be broken or has become disconnected from the linkage connection at one or the other ends of the cable. I think that cable controls the amount of coolant going to the heater core. The sliding temp control seems to be free moving with no tug or dray resistance. Two problems with my thinking is (1) If the heater in the back is working then the coolant control valve seems to me would also be working. (2) I can't seem to get to either end of that control cable without dismantling a whole bunch of other stuff. However, if the heater core is getting hot coolant then my thinking may be that there is another problem perhaps with the air flow valve in the air duct system. In either case, I have a feeling that I'm in for either a cold driving winter or an expensive repair job. Any thoughts or suggestions? By the way, A/C works fine in both areas.
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Popular Answer
on October 26, 2010
Your dash ventilation system uses a different temperature blend control than your "passenger" ventilation system.

Sounds like you have plenty of coolant flow through the heater lines. Sounds more like a temperature blend door issue in the dash area - like a failed actuator motor. That is where I would look first. Good luck!
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