Hi, I've got a 2004 Cavalier and when the heater is turned on it makes a clicking noise (sounds like someone on a snare drum playing over and over again) You can feel it if you touch the bottom of the Heater/AC module on the passenger side of the car above your feet.
It stops when you turn the heater control to the recirculation position.
My guess is it's the recirculation door actuator motor, but I can't find it through NAPA or any automotive parts online sites, does anyone know what the Chevy part number is for this, and/or a parts blowup of the HVAC module? Also, the factory service manual I've got says that the entire HVAC unit needs to be drained of 134 and removed from the vehicle to replace this actuator, does anyone know if it can be done without removing the entire unit? From the few pictures it shows of where the actuator is, that part appears to be near the top (that's why I'd like to see a parts blowup if possible).
Thanks, Pat