It is controlled by a blend door actuator which is a small electric motor.
Gm blend door actuator.
This grind or click sound is actually the plastic gears stripping inside.
The blend door or vent door mixes warm and cool air to be sent to your vents.
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A plastic gear set is frequently rotated from one side to another by the electric motor an actuator can become faulty if the plastic gear set turns out to be fragile and it breaks.
I am trying to change the blend door actuator on the drivers side of a 2005 chevy trailblazer.
Does the whole dash need to come out to get to this part.
If you re only able to get cold or very hot air from your vents there may be a problem with the blend door or actuator.
When you turn the knob on your dash to the desired temperature the actuator moves the blend door to achieve the proper mix.
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The gear replaces a brittle plastic gear that splits causing most blend door actuator failures.
Air door actuator replaces 15 73952 52495593 89018374 604 112 compatible with chevy gmc cadillac hummer 2003 2014 models hvac blend control actuator air heater blend door.
On the gmc acadia and the chevrolet traverse the replacement part number for the blend door actuator is 15 73989.
This actuator assembly might fit a few other models but double check the part numbers for your car.
A blend door actuator is linked to an air control door pivot found on the last drive of the unit.
Buy a genuine factory replacement hvac blend door actuator 52474810.
Manufactured to meet or exceed the original specifications in fit form and function acdelco gm original equipment actuators are built to deliver trouble free performance.
Parts counter people call this the upper actuator.
Acdelco gm original equipment actuators properly control the opening and closing of the blend door in your vehicle.