Ford F-150 2001 Climate Control System Workshop Manual page 27

2001 F-150 Workshop Manual
F4 CHECK THE CIRCUIT RESISTANCE
A/C Blower Motor Resistor
A/C Blower Motor
F5 CHECK THE BLOWER MOTOR SWITCH
F6 CHECK THE BLOWER MOTOR SWITCH RESISTANCE
Blower Motor Switch
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No
REPAIR Circuit 57 (BK). TEST the system for normal operation.
Measure the resistance between A/C blower motor resistor C191-2, Circuit 261 (O/BK), and the A/C blower motor
C190-1, Circuit 261 (O/BK).
Is the resistance less than 5 ohms?
Yes
INSTALL a new A/C blower motor resistor. RETEST the system for normal operation.
No
REPAIR Circuit 261 (O/BK). TEST the system for normal operation.
Turn the function selector switch to the FLOOR position and slowly rotate the blower motor switch from the LO
position to the HI position and back several times.
Does the A/C blower motor operate in all switch positions without interruption?
Yes
CHECK the system operations in all function selector switch positions and A/C blower motor speeds. If OK,
ADVISE the customer on correct operation of the system.
No
GO to F6.
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
CHECK for opens and shorts; REPAIR as required Circuits 752 (Y/R) or 754 (LG/W). RETEST the system for
normal operation.
No
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