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Home › Nissan-Datsun › 1992 › Stanza SE, Automatic, RE4F02A › Repair and Diagnosis › Engine Performance › System › Engine Controls - System/Component Tests › Miscellaneous Controls › Radiator Cooling Fans

Radiator Cooling Fans

NOTE: For radiator cooling fan relay testing, see RELAYS  under RELAYS & SOLENOIDS.

The ECU controls radiator cooling fan(s) based on vehicle speed, engine coolant temperature and A/C switch position. The following tables list correct cooling fan operation based on certain conditions. See appropriate A/C SWITCH ON or A/C SWITCH OFF table.

If cooling fan does not operate as specified, see RADIATOR (COOLING) FAN CONTROL  diagnostic chart. Diagnostic chart is not available for Pathfinder and Pickup.

A/C SWITCH & BLOWER SWITCH ON (STANZA)

Engine Coolant Temp. °F (°C) (1) Cooling Fan Speed Relay No. (Off Or On)
Evaporator Outlet Temp. Above 46°F (8°C)
Less Than 201 (94) (2) High 1 & 2 (On)
203-210 (95-99) (3) High 1 & 2 (On)
Greater Than 212 (100) High 1 & 2 (On)
Evaporator Outlet Temp. At 37-46°F (3-8°C)
Less Than 201 (94) (2) Low 1 (On), 2 (Off)
203-210 (95-99) Low 1 (On), 2 (Off)
Greater Than 212 (100) High 1 & 2 (On)
(1) The radiator cooling fan will operate at high speed if engine (coolant) temperature sensor is defective.
(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.
A/C SWITCH OFF (STANZA)

Engine Coolant Temp. °F (°C) (1) Cooling Fan Speed 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 will operate at high speed if engine (coolant) temperature sensor is defective.
Fig 1: Identifying Diagnostic Chart Symbols
G90A20594Courtesy of NISSAN MOTOR CO., U.S.A.
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