RAM 1500 Van V8-5.9L VIN Z (1998)
Air Door Actuator / Motor: Description and Operation
SYSTEM OPERATION
Blend-Air Door Motor
The blend-air door on heater-only and heater-A/C models is connected with a short mechanical link to an electronic blend-air door actuator motor.
The blend-air door motor controls the positioning of the blend-air door in the heater-A/C housing. The blend- air door motor is mounted to the top
of the right end of the distribution duct under the instrument panel in the passenger compartment.
A mechanical link is attached to the end of the blend-air door motor lever in the passenger compartment and passes through a bellows-type boot
and a small hole in the dash panel to the engine compartment. In the engine compartment, the link is attached to the end of the blend air door lever
on the top cover of the heater-A/C housing.
The blend-air door motor is controlled by a potentiometer that is integral to the heater-only or heater-A/C control. The rotary-type temperature
control knob positions the potentiometer, and the potentiometer controls the voltage to the blend-air door motor. The blend-air door motor moves
the blend-air door based upon the voltage level of the signal received from the potentiometer.
The blend-air door motor is accessible for service through the instrument panel glove box opening. The blend-air door motor cannot be repaired
and, if faulty or damaged, it must be replaced. The mechanical link and boot are available for service replacement.
