This is the anniversary edition correct? Does it have the automatic or manual control system. They are slightly different. But the most common issue is a broken vacuum line or bad vacuum control from the control head.
If it is a bad vacuum actuator the heater box has to come out to get to it. That means the instrument panel has to come out, the AC and heater system has to be drained and discharged, then you can get to the controls that are on top of the HVAC module behind the dash.
It is a real bear to do so I hope the issue is a line.
Images (Click to enlarge)
Saturday, July 15th, 2017 AT 3:32 PM