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Q: My blend door isnt working.

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My blend door isn't working. I have replaced the actuator and the temp control switch. It does not have climate control. I can open and close it manually.

My car has 138000 miles.
My car has an automatic transmission.

The next thing to do is to check all the power and ground circuits. Looking at a manual temperature controlled Taurus, the switch is a part of an integrated temperature control module. Inside this module is a temperature control potentiometer. It is this potentiometer that signals the actuator’s position. Testing the signals between the temperature module and actuator requires code retrieval from the body control module, a flow chart and a mulitmeter. Even with a manually set temperature, there is a module that the switch is attached to for determining the correct blend door position. This module could be at fault or there could be a bad connection somewhere in the circuits for this system. This can be a complicated testing process, so if you need assistance, a certified YourMechanic technician can be dispatched to your location to perform a Heating and A/C inspection on your vehicle and suggest any necessary repairs.

Good luck!

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