what is inside the back trim, above the rear tire

[cmc76]

on the passenger side, above the rear tire. behind the plastic trim.
guessing its the hvac for the rear, but even when fan off, ive got a rythmic clicking coming from there.
before i rip into it, what am i looking at, looking for?

 

[NathanJax]

Yes it's the AC

 

[Fosscore]

@cmc76

Here's what you will see behind that panel.

 

[cmc76]

i haven't opened it up yet, but what would be running that is clicking? i don't have the rear ac or heat on. is there something that just constantly circulates air?

and thanks for the pic

 

[Mr. 960]

one of the actuator is stuck or has a broken gear and keeps clicking. Probably the one that controls hot to cold.

 

[retiredsparky]

Michael, in the picture you have provided, is that the BCM under the second row drivers side seat and is that the common place for BCMs in different years?

 

[Fosscore]

@retiredsparky

Under the 2nd row drivers seat is my amp.

BCM is under the steering column for my year.

I did find this info in another thread about a different location for certain OBS trucks.

http://www.gm-trucks.com/forums/topic/37488-body-control-module-location/

 

[cmc76]

so i pulled the trim panels off, but didnt see anything obvious. but when i turn on the rear system, turned to heat. still blowing cold from those vents. My guess is its the actuator. Does anyone have a part # for the rear blend door actuator. I had it chicken scratched on a paper and naturally lost it.