Ford F-150 2001 Climate Control System Workshop Manual page 28

2001 F-150 Workshop Manual
PINPOINT TEST G: NO OPERATION IN HIGH BLOWER SETTING
CONDITIONS
G1 CHECK THE A/C BLOWER MOTOR OPERATION
G2 CHECK THE A/C BLOWER MOTOR SPEED
G3 CHECK THE BLOWER MOTOR SWITCH
Blower Motor Switch
G4 CHECK THE OTHER A/C BLOWER MOTOR SPEEDS
G5 CHECK THE BLOWER MOTOR SWITCH CONNECTOR
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INSTALL a new blower motor switch. TEST the system for normal operation.
DETAILS/RESULTS/ACTIONS
Turn the function selector switch to the FLOOR position and the blower motor switch to the position next to the HI
position.
Does the A/C blower motor operate?
Yes
GO to G2.
No
GO to G4.
Turn the function selector switch to the FLOOR position and the blower motor switch to the HI position.
Does the A/C blower motor operate?
Yes
CYCLE the blower motor switch from HI to LO several times. If the blower operates each time, ADVISE the
customer of correct system operation. If the blower does not operate correctly, INSTALL a new blower motor
switch. TEST the system for normal operation.
No
GO to G3.
Measure the resistance between the blower motor switch terminals in each switch position.
Switch Position Continuity Between Terminals
LO None
Low medium 2 and 3
High medium 2, 3 and 4
HI 1, 2 and 4
Is the resistance between the specified terminals less than 5 ohms?
Yes
REPAIR Circuit 57 (BK). RETEST the system for normal operation.
No
INSTALL a new blower motor switch. RETEST the system for normal operation.
Turn the function selector switch to the FLOOR position and the blower motor switch to the LO position and then
to the next position.
Does the A/C blower motor operate in both positions?
Yes
INSPECT the harness connector at the blower motor switch. INSTALL a new harness connector if damaged. If
OK, INSTALL a new blower motor switch.
No
If the blower doesn't work in LO, INSTALL a new A/C blower motor resistor.
If the blower works in LO, GO to G5 .
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