Heating & ventilation (Blower): Description and operation

Blower

The blower controls the volume of air being supplied to the distribution outlets. The blower is installed in the driver’s side of the casing and consists of an open hub, centrifugal fan powered by an electric motor. The open end of the fan surrounds the air inlet, which is on the passenger’s side of the casing. The blower switch and the resistor pack control the operation of the blower, which can be selected to run at one of four speeds.

Resistor pack

The resistor pack supplies reduced voltages to the blower motor for blower speeds 1, 2 and 3. For blower speed 4, the resistor pack is bypassed and

battery voltage drives the motor at full speed. The pack is installed in the RH side of the casing, in the air outlet from the blower fan, so that any heat generated is dissipated by the air flow.

Interior view of heater assembly (RH drive shown, LH drive similar)

1. Heater matrix
2. Casing
3. Distribution main flap
4. Blower fan
5. Blend flap
6. Distribution fresh air flap