How does the temperature door and blend door work?
The temperature door diverts air over the evaporator for cool air or points the flow over the heater core for warm air. The blend door diverts the airflow to the defroster vents in the upper dashboard, the floor discharge for heat or the center vents for air conditioning. Carmakers have used this basic design for 100 years.
Can a heater be removed from a blend door?
If the door is stuck the heater plenum with need to be removed and the problem resolved before installing the new unit. To test the blend door operation and too double check that you are changing the correct actuator motor turn the blower motor on and work the door in each way. You will be able to feel the air change temperature or vent level.
How can I tell if my blend door actuator is bad?
To test the blend door operation and too double check that you are changing the correct actuator motor turn the blower motor on and work the door in each way. You will be able to feel the air change temperature or vent level. Compare the bad actuator to the new unit.
Why does my Blend door not turn on?
Owners with dual zone systems often say the passenger side doesn’t respond or becomes stuck in the cold or hot position. As with the blend door motor you’ll hear a click or grinding sound as the gears strip trying to make the adjustments.
The temperature door diverts air over the evaporator for cool air or points the flow over the heater core for warm air. The blend door diverts the airflow to the defroster vents in the upper dashboard, the floor discharge for heat or the center vents for air conditioning. Carmakers have used this basic design for 100 years.
Can a broken blend door cause an air conditioner to stop working?
A broken blend door may cause erratic heater and air conditioner operation on a range of vehicles. The solution to this problem may be less involved than previously thought. Heater and air conditioner blend door failure is a common problem on many popular passenger car, truck, SUV and van models.
Since this is just a small electronic part, this won’t be unheard of. If that happens, the blend door won’t work, and it’s likely your temperature will just be stuck on one setting with no ability to adjust the intensity up and down, or alternate between things like the lower vents or the defroster.
What does a blend door actuator do for You?
As you adjust the temperature up and down, or the intensity of the air flow, the signals go through the actuator. This controls things like defrost as well as whether or not the air is going to come through the floor vents or the mid-level vents and so on.