I have the same trouble with a/c working but heat not on 2006 Grand Marquis. The blend door actuator only operates in clockwise direction meaning it will only turn the blend door to the cooling side with heater core access closed off.I removed the blend door actuator (no an easy task!)To turn the blend door lever by hand to heat and the heat works but no matter what I set the controls on dash to, the blend door actuator will not operate in counter clockwise direction to move the lever to heat.I did not test the 6 wire plug that attaches to the actuator to check for function.I'm guessing that the hot and cool adjuster on the control panel must not send a signal for heat since if the actuator is in the heat possition when I mount it, then I switch it to cool the lever moves the door to that cool direction(clockwise) but nothing will make the actuator move count clockwise to set to heat?Perhaps the heat/cool dash dial has a problem and doesn't send a impulse for heat?My dash controls are not the X type that I see most have with the code reading capability but mine has only 3 knobs with fan speed to left, middle is heat/cool blender, and right is High A/C, Low A/C, Vent, OFF, Defrost, Mix, Floor settings. All the functions for air directions to floor. Mix, defrost, vents, all move and direct those duct settings correctly. These controls are below the radio. The door that the first moderator describes is next to the passenger side upper kick panel where a box has a large exposed foam door that I believe directs air draw from the cars inside to drawing from outside the car, and mine is functioning also.
Thursday, December 13th, 2018 AT 9:36 AM
