Question about 2003 GMC Yukon XL
How do I replace the recirculation mode door actuator in my 2003 Yukon due to it being jammed and not moving when commanded?
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Posted on Jan 02, 2017
SOURCE: Gmc yukon stuck in park.
possible brake switch not sending signal to shifter solenoid to allow shifter movement. possible broken shifter knob/relay rod in shifter assembly
Posted on Nov 15, 2009
u have a loss of engine vacuum to the dash control that moves the actuators that change the air flow around to the diff locations of the dash. Start at the engine supply hose and work backwards, the vacuum line comes in on the passenger side from the engine bay, it is under the dash along with other plastic vacuum lines the supply line is black, u will need a MITYVAC brand tester to check the vacuum supply to the diff vacuum actuators in the dash.
Posted on Mar 16, 2010
Testimonial: "Right on the money! I was transporting some 8' pvc pipes and they knocked out the vacuum line. Fix took 1 minute."
Had the same problem with my 2003 Denali, dealer said they would have to replace the entire "module" for around $928, plus four hours labor. I called a sunroof repair shop and they said to hold down the "close" button for 10 seconds and it would re-set itself. It worked perfectly. Never going back to that dealer again!
Posted on Oct 11, 2010
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The mode and defrost actuators are connected to the mode and defrost doors by a cam type linkage system. Depending on the position of the door, air is directed through the HVAC module and distributed through various ducts leading to the outlets in the dash. If the HVAC control module detects a fault with the mode or defrost doors the HVAC control module will try to drive the actuator for a predetermined amount of time, to defrost, which is the defaulted position for the mode and defrost door actuators. When the mode switch is placed in the defrost or defog positions the A/C is commanded on and the recirculation door is moved to the outside air position to help reduce window fogging. A/C is available in all modes and recirculation is only available in the panel and bi-level modes.
Circuit Description The following DTCs are for the HVAC door actuators: ?€¢
B0248 is for the defrost actuator.
B0263 is for the mode actuator.
B0408 is for the left air temperature actuator.
B0418 is for the right air temperature actuator.
The HVAC control module controls the HVAC door actuators to regulate the airflow through the HVAC system. Each actuator consists of a stepper motor, a logic circuit, and a potentiometer. The potentiometer inside the door actuator allows the module to monitor the current position of the actuator drive shaft. The logic circuit inside the actuators receives control signals from the HVAC control module and controls the internal stepper motor. When a door positional change is required, the HVAC control module calculates a commanded door position. The module compares the commanded door position to the actual door position and determines the needed direction of motor rotation. The module applies a signal voltage to the door control circuit that is an input to the internal logic circuit of the door actuator. A 5 volt signal increases the door position. A 0 volt signal decreases the door position. When the commanded door position is equal to the actual door position, the HVAC control module sends a 2.5 volt signal to the door actuator and motor rotation stops. The ignition 3 voltage circuit provides source voltage to the logic circuit. The module provides ground to the actuator logic circuit through the low reference circuit. I would start by having the HVAC control module checked for DTC'S -diagnostic trouble codes First . Then check the system by using scan tool data . 1
Did you perform the HVAC Diagnostic System Check?
Go to Step 2
Go to Diagnostic System Check - HVAC Systems - Manual
Go to Diagnostic Aids
Go to Step 3
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