2003 Dodge Durango electrical system problems

Tl*the contact owns a 2003 dodge durango. While driving at an unknown speed, the wire harness for the air conditioner and heater becomes too hot and melts the two connecting wires. The failure has been repaired two or three times, but still persists and causes the vehicle to become very hot. The contact has paid over a $100 for each repair. The dealer stated that there was no recall for the failure and it must be repaired every time. The failure mileage was 93,000.

While driving the vehicle will switch into four wheel low. The indicator light flashes as if it is in four low. The last time we were traveling 35 miles per hour and it happened. I've read about the variety of electrical problems and believe this is one more. The key fobs quit working and we had a strange "p d one" message flash on the odometer. It has been to the dealer three separate times and they have told us we were switching the knob. They won't believe us because they can't make it happen.