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Chevy Impala blend door actuator on driver's side of HVAC dual zone unit

persevere1persevere1 Posts: 10
edited June 17 in Chevrolet

I read so many articles on blend door actuators and they always refer to blend door actuator on passenger side causing clacking noise. But on Dual Zone units there is also an actuator for the driver's side. And to my understanding the whole HVAC unit has to be removed to replace this actuator??? TRUE or False ?? Also if true, what is the part number for 2006 Impala ??

Comments

  • Mr_ShiftrightMr_Shiftright CaliforniaPosts: 45,116

    There's an air temperature actuator right and left, and also a mode actuator and a recirculation actuator.

    You may need to do a scan to determine what's going on here.

    In any event, I didn't see any labor rates to indicate some massive disassembly, no.

    I don't personally know this system, so I can only give you some general information to help you diagnose the exact problem.

    Air Distribution The HVAC control module controls the mode actuator in order to distribute airflow to a desired outlet. The mode switch provides the vehicle operator with the ability to override the automatic setting. When the mode switch is moved to heater through Defrost positions, the A/C compressor clutch engages and the recirculation actuator will be moved to the Outside Air position. When VENT is pressed, the following will occur: The mode valve will be moved to the Panel position. The recirculation actuator will follow user request if the blower is ON and the power mode is in Run. The A/C compressor will follow user request if the blower is ON and the power mode is in Run.

    Recirculation Operation The HVAC control module controls the air intake through the recirculation actuator. Recirculation is not available when the mode is in heater through Defrost. The operator must activate the blower for Recirculation operation.

    Air Temperature Actuator The air temperature actuator is a 2-wire bi-directional electric motor. Two control circuits enable the actuator to operate. The control circuits use either a 0-volt or 12-volt value to coordinate the actuator movement. When the actuator is at rest, both control circuits have a value of 0 volts . In order to move the actuator, the HVAC control module grounds the appropriate control circuit for the commanded direction. The HVAC control module reverses the polarity of the control circuits to move the actuator in the opposite direction.

    The HVAC control module determines the door position by counting motor pulses on one of the control circuits. These pulses are small voltage fluctuations that occur when the brush is shorted across 2 commutator contacts as the motor rotates. As the actuator shaft rotates, the HVAC control module monitors the voltage drop across an internal resistance to detect the pulses. The HVAC control module converts the pulses to counts with a range of 0-255 counts. The HVAC control module uses a range of 0-255 counts to index the actuator position.

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  • persevere1persevere1 Posts: 10

    Thank You. You have confirmed what I thought regarding the fact that there are 4 actuators. 3 of them are accessible by dropping the glove compartment. But I believe the blend door actuator (air temp) for the driver's side requires a great deal of disassembly in order to replace it if this is the culprit. Can you confirm ? 2006 Impala LT dual zone..

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