Gm Blend Door Actuator Testing

A blend door actuator is linked to an air control door pivot found on the last drive of the unit.

Gm blend door actuator testing.

Match the new actuator compare the bad actuator to the new unit. An actuator can become faulty if the plastic gear set turns out to be fragile and it breaks. To test the blend door operation and too double check that you are changing the correct actuator motor turn the blower motor on and work the door in each way. You can test the actuator inputs by unplugging it turning on the ignition and checking the wire harness from pin 7 to 10 outside wires for 12v.

These days it s electrically driven actuator motors modules accomplishing the job. The gm c 67 system found in w body cars uses this design. There are several types of actuator motors used in today s gm cars. You will be able to feel the air change temperature or vent level.

Also check from pin 7 to 8 middle wires for a continuously varying voltage while rotating the mode selector. Be aware that many of these vehicles are equipped with a slave door which works in conjunction with the blend door to control temperature. The actuator contains a logic circuit that interprets that voltage and powers the motor to move the door to the corresponding position. Learn how to reset the hvac actuator with acdelco.

Parts counter people call this the upper actuator. A plastic gear set is frequently rotated from one side to another by the electric motor. How to test blend door actuator climate control heater temp control any car in this video we will show you how to test blend door actuator and to make sur. In addition to an electronic blend door actuator the gm c 67 system uses a solenoid box to operate the mode and recirc doors through vacuum motors.

Gm electrically driven actuator motors. This grind or click sound is actually the plastic gears stripping inside.