08GT500
5 Year Member
Additionally, Rich, it’s ironic that we had the IAC, then the hiss, now the clicking. There are indeed vacuum lines that feed the blend doors, the actuators for operating the ducting for the HVAC There is a positive source of Vacuum there, and it initiates the opening and closing of these ducts.
It has occurred at least once to my knowledge that the vacuum signal was interrupted and the actuators slammed the doors open and closed, making a loud ‘rap’ noise, Occurring when the Fan, A/C was off.
-John
It has occurred at least once to my knowledge that the vacuum signal was interrupted and the actuators slammed the doors open and closed, making a loud ‘rap’ noise, Occurring when the Fan, A/C was off.
-John