F: BLOWER MOTOR DOES NOT OPERATE PROPERLY

PINPOINT TEST F: BLOWER MOTOR DOES NOT OPERATE PROPERLY

F1 CHECK BLOWER OPERATION

- Turn ignition switch to RUN, Function Selector knob to FLOOR and blower knob at LO.

- Does blower motor operate?

- Yes
Go to F5.

- No
Go to F2.

F2 CHECK BLOWER SWITCH OPERATION

- Slowly move blower knob from LO to HI. Stop at each detent and check for blower operation.

- Does blower motor operate in any speed except HI?

- Yes
Go to F4.

- No
Go to F3.

F3 CHECK GROUND CIRCUIT

- Check Circuit 57 (BK) from resistor assembly to ground for an open.

- Is ground wire open?

- Yes
Service and/or Replace as required.

- No
Replace resistor assembly.

F4 CHECK CIRCUIT

- Check Circuit 261 (0/BK) between blower motor and blower motor resistor for open.

- Is circuit open?

- Yes
Service as necessary and check blower motor operation.

- No
Replace resistor assembly.

F5 CHECK BLOWER SWITCH

- Check blower motor operation several times in each blower knob position.

- Does blower motor operate in all knob positions without interruption?

- Yes
Check system operation in all Function positions and blower speeds. If OK instruct owner on correct operation of system.

- No
Go to F6.

F6 CHECK BLOWER SWITCH CONTINUITY












- Remove harness connector from blower switch and check continuity through switch in each position.

- Is switch continuous in all positions?

- Yes
Check continuity of Circuit 754 (LG/W) and Circuit 752 (Y/R) between blower switch and resistor assembly. Service as required.

- No
Replace blower motor switch.