I have a 97 GMC Savana van with 5.0 V8, auto, 167,000 miles. When I use the express down feature on the driver's side window, the power remains on the window motor and overheats the window motor. This only occurs on the ignition key side with the motor running. I have changed the window switch and the window motor. 14 volts to the window motor with the engine running. Works fine in accessory mode. Any ideas?