Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello my name is***** am an ASE Master Technician and I am glad to help you out with your question.
The clicking sound could be the blend door actuator, or I have also seen the blend door itself break and cause this noise to happen. Start with replacing the blend door actuator, the heater core could be plugged as well. You could try backflushing the heater core to free the blockage.
The customer states the heater is inoperative.
Confirmed the customer's complaint and found the heater was inoperative. Operated the heating, ventilation and air conditioning controls and observed the temperature blend door did not respond. Performed an inspection of the temperature blend door actuator wiring harness and connectors and found there were no loose connections or signs of damage. With the key on, engine off, used a multi-meter to check for the presence of voltage at the temperature blend door actuator and found voltage was present. Used a set of fused jumper wires to apply voltage and ground to the temperature blend door actuator and found the actuator was inoperative. Removed the temperature blend door actuator and manually operated the temperature blend door. Observed the temperature blend door moved smoothly and did not bind. The results of these tests verified the temperature blend door actuator was faulty.
Replaced the temperature blend door actuator and verified the vehicle operated properly. The customer's concern did not return.
blend door actuator
Air Temperature Actuator Replacement
Fig 1: View Of Right Air Temperature Actuator & Mode Actuator
NOTE: Refer to Fastener Notice in Cautions and Notices.
Fig 2: View Of Right Air Temperature Actuator & Mode Actuator
Tighten: Tighten the screw to 1.5 N.m (13 lb in).
Please reply to this if you need more help and we can continue this conversation at no extra charge. This does not have to be my only answer. If you are satisfied with my service, please rate at the top of the screen. Rating does not close out your question. Remember, sometimes it is difficult to completely diagnose your vehicle without being there, but I will try to give you the best answer I can. Hoping to be giving you 5 star service.
Disconnect the negative post on the battery.
Your welcome, please RATE at the top of the screen and it would be appreciated, thanks.