Rear Blower (Automatic System Only)

Rear Blower (Automatic System Only)

The blower is installed between the front seats, in the rear face air duct, and consists of an open hub, centrifugal fan powered by an electric motor. Operation of the electric motor is controlled by a thumbwheel on the rear passenger face vent via the ATC (automatic temperature control) module and a blower motor control module (voltage amplifier) installed in the outlet of the fan.

The thumbwheel operates a variable potentiometer, which outputs between 1.25 V (blower off) and 5 V (maximum blower speed) to the ATC (automatic temperature control) module. The ATC (automatic temperature control) module then outputs a proportional control voltage between 0 and 5 V to the blower motor control module, which regulates a battery power feed from the rear blower relay to the blower to produce the related blower speed.

The rear blower relay is installed in the AJB (auxiliary junction box) and energized while the ignition is on.

Rear Blower Motor Control Module