Pinpoint Test E: The Electric Cooling Fan(S) Stays On All The Time

WARNING: This page is about a different car, the 2004 Mercury Monterey and 2004 Ford Freestar. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before carrying out the following test, diagnose any PCM DTCs.

E1 CHECK OPERATION OF THE ELECTRIC COOLING FANS
- Key in ON position.
- Observe fan operation.
- Is only one fan running?
Yes

RH cooling fan, GO to E2. LH cooling fan, GO to E3.

No

Go To PINPOINT TEST F: THE ELECTRIC COOLING FAN(S) INCORRECT OPERATION .
E2 CHECK CIRCUIT 1825 (LG/YE) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: RH Cooling Fan Motor C1077.
- Key in ON position.
- Measure the voltage between the RH cooling fan motor C1077-1, circuit 1825 (LG/YE) and ground.
  
  Fig 1: Checking Circuit 1825 (LG/YE) For A Short To Voltage
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
Yes

REPAIR circuit 1825 (LG/YE) for a short to voltage. TEST the system for normal operation.

No

INSTALL a new cooling fan relay 2. TEST the system for normal operation.
E3 CHECK CIRCUIT 1824 (LG/VT) FOR A SHORT TO VOLTAGE
- Key in OFF position.
- Disconnect: LH Cooling Fan Motor C1074.
- Key in ON position.
- Measure the voltage between the LH cooling fan motor C1020-2, circuit 1824 (LG/VT) and ground.
- Measure the voltage between the LH cooling fan motor C1074-1, circuit 1824 (LG/VT) and ground.
- Is the voltage greater than 10 volts?
  Yes
  
  REPAIR circuit 1824 (LG/VT) for a short to voltage. TEST the system for normal operation.
  
  No
  
  INSTALL a new cooling fan relay 1. TEST the system for normal operation.