How to Replace a Blend Door Motor
First of all let’s bet an idea of what a blend door motor does. Inside your car;
heat comes from the air passing over the
heater core and cold air comes from
the air passing over the air
conditioner evaporator. Inside the heater box is where the blend door is actuated
by a blend door motor that closes and opens it depending on the temperature selected
inside the vehicle. To find out if your blend door motor is working properly, start
engine and select the low fan setting and move the climate control from cold to
warm and back while listening to the sound of the blend motor through the vents. You should hear it activate while changing from warm to cold. If you only have heat
then you may have a vacuum leak
or your blend door motor is bad and should be replaced. To give you an idea of what
is involved it replacing the blend door motor, you have to see where it is located.
If behind the dash sounds like a tough spot to be located and you are right, it
is but not impossible. On some vehicles, you can access the blend door motor without
removing anything from under the dash, while others require massive disassembly.
If you have the latter, here are some tips.
You will be working under the car dash so wear appropriate protective clothing,
gloves and eyewear. Park your car on level ground and set the emergency brake. Tools Needed to Complete this Repair Job
2.Sockets and Wrenches
3. Pliers Instructions
Step 1 - Get a diagram
of your vehicle’s heater and
system and the component locations of the blend door motor and actuators.
Step 2 - Remove the dash enough to access the heater box. Leave as much intact
as possible, you only need to get enough room to get the heater box out, but don’t
Step 3 - Disconnect the electrical connector from the blend door motor.
Step 4 - Remove the heater box (if needed)
Step 5 - Disconnect the linkage from the blend door motor and the actuator
Step 6 - Remove the blend door motor and replace with new.
Step 7 - Connect linkage to blend door motor, always check that the blend door
moves freely before installation
Step 8 - Install heater box
Step 9 - Connect electrical connection to the blend door motor Best Practices
If further technical assistance is needed, our certified car repair technicians
are ready to answer your car questions. For manufacturer
specific repair information visit -
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