Question about 2004 Chevrolet Avalanche
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Posted on Jan 02, 2017
SOURCE: whis is an air door
The air door is a flap / door that opens and closes to control the air flow for the haeter and air conditioner its usely on the heater box where the heater core is locatedon the top of the heater case unforanatly you need to take half the dash board apart to get to it. And i have the factory manual for this vehicle and it dosen' t realy tell you how to do this if you want i can fax it to you but itsnot easy and thats why they leave it so incomplete its a poor disign and they know it so they don't say
Posted on Dec 23, 2010
Same as first set of instructions:
Mode Valve Actuator Replacement - Left Side Removal Procedure
Remove the actuator linkage from the mode door linkage
Posted on Mar 22, 2012
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The mode door actuators are reversible, 12-volt direct current (DC) servo motors. The heating-A/C systems on this vehicle use two mode door actuators. One for the panel/floor-air door and one for the defrost-air door.
All actuators (1) are interchangeable with each other. Each actuator is contained within an identical black molded plastic housing with an integral wire connector receptacle (2). Each actuator also has an identical output shaft with splines (3) that connects it to its respective door linkage and three integral mounting tabs (4) that allow the actuator to be secured to the HVAC housing. The mode door actuators do not require mechanical indexing to the mode-air doors, as they are electronically calibrated by the A/C-heater control.
The mode door actuators are connected to the A/C-heater control through the vehicle electrical system by dedicated two-wire leads and connectors of the HVAC wire harness. The mode door actuators can move the defrost-air door and the panel/floor-air door in two directions. When the A/C-heater control pulls the voltage on one side of the motor connection high and the other connection low, the mode-air door will move in one direction. When the A/C-heater control reverses the polarity of the voltage to the motor, the mode-air door moves in the opposite direction.
When the A/C-heater control makes the voltage to both connections high or both connections low, the mode-air door stops and will not move. The A/C-heater control uses a pulse-count positioning system to monitor the operation and relative position of the mode door actuators and the mode-air doors. The A/C-heater control learns the mode-air door stop positions during the Actuator Calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the mode door actuator circuits.
The mode door actuators are diagnosed using a scan tool (Refer to 28 - DTC-Based Diagnostics/HVAC - Diagnosis and Testing).
The mode door actuators cannot be adjusted or repaired and must be replaced if inoperative or damaged.
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