How do you manually calibrate a blend door actuator?
How do you manually calibrate a blend door actuator?
Blend Door Actuator Motor Calibration Open hood (bonnet for the RHD guys) and locate fuse #15 in the fuse box next to the battery. Remove the fuse and wait 1-2 minutes for any capacitive charges in the system to dissipate. Replace the fuse. Turn the ignition key to the on position.
What happens to the actuator on a HVAC door?
The HVAC control head expects to see the actuator move to a certain position with the given signal provided. If the door gets outside of that preprogrammed position, the controller becomes confused and attempts to try to find the correct position by continually searching for it, or it will stop once it reaches its default position.
How does a logic actuator move a door?
Once the signal is received from the control head, the logic circuit inside the actuator uses its bidirectional electric motor to move the door to the appropriate position. When a zero voltage is applied to the circuit, the motor rotates in one direction. When 5 volts is applied to the same circuit, the motor rotates in the opposite direction.
What are the actuator motors on a GM car?
There are several types of electrically driven actuator motors used in today’s GM cars, and they all function differently. Keep reading for operation tips. Long gone are the cables and rods jutting out of the firewall to operate the heater control valve or a vacuum unit pulling a blend door open.
What happens if you put 2 volts on actuator?
If, say, 2.5 volts is applied, the motor will stop rotating. This design has sliders moving on resistive paint strips, while the previous two actuators have potentiometers.
How to perform the actuator recalibration procedure on a Cadillac?
The topic of how to perform the actuator recalibration procedure on Chevrolet , GMC and Cadillac Trucks and SUVs has become an ever increasing topic of discussion.
How to recalibrate the HVAC actuator in a GM Truck?
For manual systems it does not matter where the a/c controls are set but if you feel the need to do something, turn the blower switch on (I prefer speed 3) and set the temperature sliders about .5″ to .75″ from full cold. For auto systems, press the auto button, with the key on. Turn the ignition off.
Is there a recalibration procedure for auto HVAC?
If you have auto HVAC controls you would need to use the radio fuse instead of the ecas fuse to initiate the recalibration process. If you have manual controls there is no recalibration procedure available according to GM service information. If you need more information, it is much easier to carry on a discussion in the Ask a Question section.
What causes HVAC blend motor actuator to get stuck?
Some GM trucks in the early 2000’s may have an issue where the temperature may get stuck blowing hot air on the driver’s side and cold air on the passenger side. The culprit tends to be the HVAC blend motor/ actuator door. Before purchasing anything or attempting to make a repair, try doing the reset procedure in this video.
