GO to E10.
E8 CHECK THE BLOWER MOTOR GROUND
Turn the blower motor switch to the HI position.
Measure the resistance between the A/C blower motor C190-1, Circuit 261 (O/BK) and ground.
Is the resistance less than 10 ohms?
Yes
REPLACE the A/C blower motor. TEST the system for normal operation.
No
GO to E9.
E9 CHECK CIRCUIT 261 (O/BK)
A/C Blower Motor Resistor C191
Measure the resistance between the A/C blower motor C190-1, Circuit 261 (O/BK), and the A/C blower motor
resistor C191-2, Circuit 261 (O/BK).
Is the resistance less than 5 ohms?
Yes
REPAIR Circuit 57 (BK) for an open between the function selector switch C218-
1 and ground. TEST the system for
normal operation.
No
REPAIR Circuit 261 (O/BK) for an open. TEST the system for normal operation.
E10 CHECK CIRCUIT 364 (BK/LG) FOR AN OPEN
A/C Blower Motor Relay
Measure the voltage between A/C blower motor relay connector Pin 87, Circuit 364 (BK/LG) and ground.
Page 23 of 301999 F-150/250 Workshop Manual
8/16/2010http://www.fordtechservice.dealerconnection.com/pubs/con...
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