Ford - Taurus :: 2001 - Automatic Temperature Control Unit / No Heat
Feb 11, 2015
The car is a Taurus Wagon. It does not put out any heat. It is a flapper door issue. I tried changing the blend door actuator as the old one did not move when the temperature was changed from cold to hot. Unfortunately the NEW one doesn't either, nor does it move when left hanging, not in the dash. It is an automatic temperature control unit. When I had the actuator out from under the dash, I could move the blend doors easily with the little lever, and get excellent heat, so I know it's not a heater core issue.
Everything on the dash unit, which includes the stereo/radio controls and buttons to shift the air from floor to defrost seems to work fine. It shows the desired temp, but won't go to it. I have checked two fuses that are supposed to feed the HVAC system. I have even installed a different dash unit from another Taurus to see if it made any difference. That included a second temperature sensor, the "Y" shaped thing near where the white hose connects to the back side of dash unit.
I admit, I'm lost. I don't have a good wiring diagram, and don't know if I could read it well enough if I did.
Is there a relay or something in the system between the controller and the actuator that I don't know about?
Which wire or wires in the multi-pin connector that plugs into the blend door actuator are supposed to be hot at what point?
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I have a 2012 Avalon Limited with the automatic temperature control. It used to be that the recirculation function was controlled automatically. The recirculation function would come on when ever the outside temp was hot enough and the inside temp setting was low enough. This is also how my 2000 Avalon XLS works and how my 2014 Tundra 1794 Edition works. Both have the automatic air conditioning system. Now the recirculation function must be turned on manually in order for it work. This has just been happening for the last 3-4 months. The dealer service writer tells me that all 2010 through 2012 Avalons with the automatic temp control Air Conditioning require the recirculation function to be controlled manually. Is this really true?
The manual makes no mention of this requirement to control the recirculation function manually. The manual says that the recirculation function MAY be controlled manually, but, when the A/C is on automatic temp control, the recirculation function is turned on and off by the A/C, depending upon the outside air temperature and the interior vehicle temp setting chosen on the A/C front panel.
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