Three Speed Fan Operation

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 ENGINE CONTROL COMPONENTS for system information.

Fig 1: Low Fan Control (LFC) Relay Connector

Courtesy of FORD MOTOR CO.

LOW FAN CONTROL (LFC) RELAY CONNECTOR PIN REFERENCE CHART

Pin	Circuit
1	LFC (Low Fan Control)
2	VPWR (Vehicle Power)

Fig 2: Medium Fan Control (MFC) Relay Connector

Courtesy of FORD MOTOR CO.

MEDIUM FAN CONTROL (MFC) RELAY CONNECTOR PIN REFERENCE CHART

Pin	Circuit
1	MFC (Medium Fan Control)
2	VPWR (Vehicle Power)

Fig 3: High Fan Control (HFC) Relay Connector

Courtesy of FORD MOTOR CO.

HIGH FAN CONTROL (HFC) RELAY CONNECTOR PIN REFERENCE CHART

Pin	Circuit
1	HFC (High Fan Control)
2	VPWR (Vehicle Power)

Fig 4: Left Fan Motor Connector

Courtesy of FORD MOTOR CO.

LEFT FAN MOTOR CONNECTOR PIN REFERENCE CHART

Pin	Circuit
3	GND (Ground)
1, 2	LSFAN PWR (Low Speed Fan Power)

Fig 5: Right Fan Motor Connector

Courtesy of FORD MOTOR CO.

RIGHT FAN MOTOR CONNECTOR PIN REFERENCE CHART

Pin	Circuit
2	MSFAN PWR (Medium Speed fan Power)
1	GND (Ground)
2	HSFAN PWR (High Speed Fan Power)

Fig 6: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

POWERTRAIN CONTROL MODULE (PCM) CONNECTOR PIN REFERENCE CHART

Pin	Circuit
B36	HFC (High Fan Control)
B18	MFC (Medium Fan Control)
B34	LFC (Low Fan Control)