So I bought a used 2008 enclave with 142k miles on it! 2nd day driving it the air in the rear quit! When I move the the knobs on the back of the center console the aux light illuminates so I know they’re sending the signal. Checked all the fuses, all good. Anybody has this issue? I would assume it has 2 separate blower motors maybe the rear is no good? How can I check without going to the dealer?