Three Speed Fan Operation

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.

Although the PCM output circuits are called low, medium and high fan control (FC), cooling fan operation is controlled by a combination of these outputs .

REFER to FAN CONTROL for more information .

Fig 1: Identifying Low Fan Control (LFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR & LFC circuits may be reversed in the harness connector. Also, the LFC circuit may be wired to 2 separate relays. REFER to the appropriate SYSTEM WIRING DIAGRAMS article for additional information.

Fig 2: Identifying Medium Fan Control (MFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR & MFC circuits may be reversed in the harness connector. Also, the MFC circuit may be wired to 2 separate relays. REFER to the appropriate SYSTEM WIRING DIAGRAMS article for additional information.

Fig 3: Identifying High Fan Control (HFC) Relay Connector

Courtesy of FORD MOTOR CO.

NOTE: The VPWR & HFC circuits may be reversed in the harness connector. Also, the HFC circuit may be wired to 2 separate relays. REFER to the appropriate SYSTEM WIRING DIAGRAMS article for additional information.