I have a 2001 5.9 2wd Durango.
My ac won't turn on. No light in the switch. I have 12v at the relay in the power distribution block. The relay seems to be fine. No corrosion or signs of heat. The whole block looks factory new. The light in the mirror heater switch blinks continuously. I can't get it to turn on or off. These things happened at the same time. They were both fine yesterday. When I started it today, they were both messed up.
Any ideas? Thanks, Gas.

 

check the grounds and electrical connections for the hvac control unit, sounds like you have a loose connections or a busted wire that is causing the problem