Ventilation Fan Motor

FAULT-TRACING HINTS

The ventilation fan will be operative when the ignition switch is in the drive position.

1. Check fuse 6 and check that the supply to it is live.

2. Check the voltage to selector switch 35 and main switch 149.

NOTE Main switch 149 is located in the air distribution control. This switch must be moved from the 0 position to close the supply circuit to selector switch 35.

3. Set selector switch 35 to different positions and check the voltages supplied to motor 36 in each position.

4. Readings across resistor 74:

Speed 1: 3.1 ± 0.3 ohm
Speed 2: 1.15 ± 0.1 ohm
Speed 3: 0.35 ± 0.1 ohm

5. Check the connectors, wiring and earth connections.