I just bought a used 2008 Expedition XLT and the rear ac was working on the first day of ownership. On the next day it worked on way to the park but on the way back the rear ac didn't come on. I have tried both the front a rear controls. I can hear a single click sound coming from the rear of the truck (blower area) when I switch the AC on and as I click though the speeds but no air flow or sound form the motor itself. The front AC is working fine but I am not sure where to start trouble shooting the rear ac issue. I have found other issues complaining about clicking sounds and bad actuator but could this be the issue if I am only here a single click.

Thanks for any info you can provide.

 

Update:
Today when I used the Expedition I tried to turn on the rear ac as I have been trying since it went out and it worked (first time it worked since it stopped 4 days ago)... I have not done anything to the system yet because I really don't know where to start.

We drove to practice, then to a game, then back home and on all three trips the Rear AC worked well with no issues.

Any ideas as to what may be causing this intermittent problem?

Thanks again for your time.

 

Udate #2:
It's not working again. Worked all morning yesterday for my wife, in the evening when we went out it didn't turn on. Again nothing was changed, when it works it works the full time the truck is running. when it doesn't work I keep the switch off until next time we start the truck.

 

Anyone know which rear a/c actuator handles the hot/cold and which one handles the ceiling/floor vent choice?