Ventilation Fan

Ventilation Fan Diagrams:

Ventilation Fan Components:

Locations of components

3 Earthing point
In the facia

22 Fuse box
In the electrical distribution box in the engine compartment on the left-hand wheel housing

35 Selector switch for the ventilation fan
In the centre of the facia

36 Motor for the ventilation fan
Behind the right-hand speaker grille

74 Resistor for ventilation fan
Accessible under the left-hand speaker grille

149 Main switch for ventilation fan
On the facia, in the air distribution control (upper contact)

150 Air distribution switch, AC position
On the facia, in the air distribution control (lower contact)

152B 29-pole red connector
In the electrical distribution box in the engine compartment, on the left-hand wheel housing. The connector is accessible from the interior of the car

Operation
Ventilation fan motor 36 has three speeds and is controlled from fan selector switch 35.

Switch 35 is supplied from fuse 9, via the 29-pole red connector 152B. The fan speed can be varied by taking the supply from different points on resistor 74.

When main fan switch 149 is closed, the fan will always be running, regardless of the position of the fan selector switch.

Main switch 149 and AC switch 150 are controlled by the air distribution control. Switch 149 is closed when the control is in any position except position 0, when it is open (control closed). Switch 150 is closed when the control is in position <- ->. The fan motor will then receive the full supply and run at the highest speed.

If resistor 74 is overloaded, the resulting heat will cause the bimetal switch to close. The positive supply will be earthed, and fuse 9 will blow. The bimetal switch will open when it has cooled.

Fault-tracing hints
The ventilation fan will be operative when the ignition switch is in the drive position.

1. Check fuse 9 and check that the supply to it is live.

2. Check that the supplies to switch 150 and switch 35 are live.

3. Turn the switch to different positions and check that the voltage to the fan motor changes.

4. Check the connectors, cable harnesses and earth connections.