H: ENGINE COOLING FAN DOES NOT OPERATE WHEN A/C IS ACTIVATED

PINPOINT TEST H: ENGINE COOLING FAN DOES NOT OPERATE WHEN A/C IS ACTIVATED

H1 CHECK VOLTAGE SUPPLY TO COOLING FAN

- Start engine and run until normal operating temperature is achieved. Turn engine OFF, leave ignition switch in RUN position.
- Actuate A/C damper door switch to MAX A/C position.
- Using a voltmeter, back-probe Pin 1, Circuit 229 (R/O) and Pin 2, Circuit 229 (R/O) for B+.

- Is there B+?

- YES
Go to H2.

- NO
Go to H3.

H2 CHECK COOLING FAN GROUND

- Using an ohmmeter connected to a known good ground, connect second lead Circuit 57 (BK) at cooling fan motor connector.

- Is resistance 5 ohms or less?

- YES
Go to H5

- NO
Service fan motor ground circuit for open circuit. Restore vehicle. Retest system.

H3 BACK-PROBE FOR VOLTAGE SUPPLY

- Using a voltmeter, back-probe Pin 3, Circuit 38 (BK/O) for B+.

- Is there B+?

- YES
Go to H5.

- NO
Go to H4.

H4 CHECK COOLING FAN RELAY FUSE

- Using voltmeter, check both sides of cooling fan relay Fuse P (30A) Town Car, cooling fan Fuse (30A) Crown Victoria, Grand Marquis, at power distribution box for B+.

- Is there B+?

- YES
Service circuit 37 (Y) for open circuit. Restore vehicle. Retest system.

- NO
Service circuit 37 (Y) for short circuit. Restore vehicle. Retest system.

H5 CHECK COOLING FAN MOTOR

- Disconnect cooling fan motor.
- Using a No. 10 gauge jumper wire, connect one end to battery positive. Connect other end to cooling fan, low terminal at fan motor.
- Using a second jumper wire, connect one end to a known good ground. Connect the other end to the ground terminal on the fan motor.

- Did cooling fan run?

- YES
Service circuit 229 (R/O) for open circuit. Restore vehicle. Retest system.

- NO
Replace cooling fan motor. Restore vehicle. Retest system.