Ford F-150 1999 Workshop Manual page 16

1999 F-150/250 Workshop Manual
A/C Compressor Clutch Field Coil C106
C14 CHECK FOR GROUND AT THE A/C COMPRESSOR CLUTCH FIELD COIL
C15 CHECK CIRCUIT 321 (GY/WH)
A/C Clutch Relay
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Measure the voltage between the A/C compressor clutch field coil C106, circuit 321 (GY/WH) and ground.
Is the voltage reading greater than 10 volts?
Yes
GO to C14.
No
GO to C15.
Measure the resistance between the A/C compressor clutch field coil C106, circuit 57 (BK) and ground.
Is the resistance less than 5 ohms?
Yes
GO to C19.
No
REPAIR circuit 57 (BK). TEST the system for normal operation.
Measure the resistance between the A/C clutch relay socket pin 5, circuit 321 (GY/WH) and the A/C compressor
clutch field coil C106, circuit 321 (GY/WH).
Is the resistance less than 5 ohms?
Yes
GO to C16.
No
REPAIR Circuit 321(GY/WH). TEST the system for normal operation.
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8/16/2010