Radiator (Cooling) Fan Control Relay Operation

A/C SWITCH OFF

Engine Coolant Temp. °F (°C)	Cooling Fan Speed (1)	Relay No. (Off or On)
Less Than 201 (94)	Off	1 & 2 (Off)
203-210 (95-99)	Low	1 (On), 2 (Off)
Greater Than 212 (100)	High	1 & 2 (On)
(1) The radiator (cooling) fan operates on high speed if the engine temperature sensor is no good.

A/C SWITCH & BLOWER SWITCH ON

Engine Coolant Temp. °F (°C)		Cooling Fan Speed (1)	Relay No. (Off or On)
Evap. Outlet Temp.: 37-46°F (3-8°C)
Less Than 201 (94)		(2) Low	1 (On), 2(Off)
Between 203-210 (95-99)		Low	1 (On), 2 (Off)
Greater Than 212 (100)		High	1 & 2 (On)
Evap. Outlet Temp. Above 46°F (8°C)
Less Than 201 (94)		(2) High	1 & 2 (On)
Between 203-210 (95-99)		(3) High	1 & 2 (On)
Greater Than 212 (100)		High	1 & 2 (On)
(1) The radiator (cooling) fan operates on high speed if the engine temperature sensor is no good. (2) The radiator (cooling) fan should be off when vehicle speed is greater than 50 MPH. (3) The radiator (cooling) fan should be on low speed when vehicle speed is greater than 50 MPH.

Fig 1: Identifying Diagnostic Chart Symbols

Courtesy of NISSAN MOTOR CO., U.S.A.