Skip the auto shop - Our mechanics make house calls

Q: My blend door isnt working.

asked by on

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!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why is my car blowing hot air and cold air at the same time?

The answer to this depends on whether you have switched on heating, cooling (A/C) or neither. In one scenario, for example, if you have not switched on the A/C system, but the A/C is running as confirmed by a visual...

Q: With engine off. Crankshaft pulley spins freely with belt on or off. 96 Taurus 3.0. What could cause that?

I can think of a few possible causes to this issue. 1. You are trying to replace the belt with a new one and may have got the wrong size belt. There are two different 3.0 V6 engines that are...

Q: Cranks won't start

The transmission fluid temperature sensor is not needed at start-up. However, if the engine coolant temperature sensor is malfunctioning that could cause hard or no starting because that temperature sensor provides an input to the PCM to enrich the mixture...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...