How to Replace a Blend Door Actuator on a Buick
The Blend Door Actuator mixes hot air with cold air by an actuator motor that opens and closes
the blend door to adjust how much hot air and cold air to mix for the temperature setting as you
have chosen. The blend door actuators in a Buick are electrically operated by blend door motors.
A computer assigned to this duty controls the blend door actuators. These are tied into several
sensors that detect the outside temperature to compensate for incoming air, inside air temperature
and even a sensor to signal when a door or window is open to speed up the fan to maintain the
On most modern vehicles, air is constantly blown through the AC evaporator core and then the
blend door can divert some or all of the air through the heater core. In full AC mode, the blend
door is closed against the heater core inlet and all air flows around the heater core and directly
into the vent system. In heater mode, the compressor is deactivated and the air flowing through
the evaporator core has no temperature change. As before, the blend door will now direct some
or all of the air flow through the heater core and into the vent system.
If Your Blend Door Actuator is not working properly, you may only get cold air coming
through the vents or maybe just hot air with no proper air conditioning in your car.
Few guidelines to replace it yourself :
Firstly you will have to open & remove the screws in the glove compartment, after removing all
screws around the glove compartment box you could gess acess to the Blend Door Actuators.
Then remove the screws that secure the Door Actuator to the HVAC box with the screwdriver.
Disconnect the electrical connections to the Actuator. Tip the actuator rearward and disconnect
the actuating rod from the blend door actuator arm.
After replacing the new Blend Door Actuator in the place insert the rod into the blend door arm.
Swing the actuator in towards the HVAC box, reinstall the screws and tighten. Reconnect the
electrical plug to the actuator. Replace the glove compartment box and door and tighten all the
screws as removed before. You could also check for car manufacturers manul for further
assistance during installation.
You need to know the various symptoms of a faulty Blend Door Actuator, to diagnose the
Troubleshooting of a bad Blend Door Actuator is usually beyond the abilities of a do-it-
yourselfer because it often requires specialized training and tools. In case, you are not confident
about pulling off this procedure, take the help from a Car mechanic.
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