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Home >> Nissan-Datsun >> 1992 >> Sentra SE-R >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Radiator (Cooling) Fan Control Relay(S)
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Radiator (Cooling) Fan Control Relay(S)

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 Flow chart.

A/C SWITCH ON (NX & SENTRA 1.6L)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH Radiator Fan
Less Than 202 (94) 50 Or More Off
" 49 Or Less Low
203-210 (95-99) N/A Low
Greater Than 212 (100)
Automatic Transmission N/A High
Manual Transmission N/A Low
A/C SWITCH OFF (NX & SENTRA 1.6L)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH Radiator Fan
Less Than 195 (90) N/A Off
196-201 (91-94) 12 Or More Off
" 12 Or Less Low
203-210 (95-99) 50 Or More Off
" 49 Or Less Low
Greater Than 212 (100)
Automatic Transmission N/A High
Manual Transmission N/A Low
A/C SWITCH ON (NX & SENTRA 2.0L - A/T)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH (1) Radiator Fan
Less Than 202 (94) 50 Or More Off
" 49 Or Less Low
203-210 (95-99) N/A Low
212-219 (100-104) 12 Or Less Low
" 12 Or More High
Greater Than 220 (105) N/A High
(1) Radiator cooling fan will operate at high speed if engine (coolant) temperature sensor is defective.
A/C SWITCH OFF (NX & SENTRA 2.0L - A/T)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH Radiator Fan
Less Than 202 (94) N/A Off
203-210 (95-99) N/A Low
212-219 (100-104) 12 Or Less Low
" 12 Or More High
Greater Than 221 (105) N/A High
A/C SWITCH ON (NX & SENTRA 2.0L - M/T)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH Radiator Fan
Less Than 202 (94) 50 Or More Off
" 49 Or Less On
203 (95) Or More N/A On
A/C SWITCH OFF (NX & SENTRA 2.0L - M/T)

Engine Coolant Temp. °F (°C) Vehicle Speed MPH Radiator Fan
Less Than 202 (94) N/A Off
203-210 (95-99) 12 Or Less Off
" 12 Or More On
Greater Than 212 (100) N/A On
NOTE: For Flow chart symbol identification, see Fig 1 .
Fig 1: Identifying Flow Chart Symbols
G90A20594Courtesy of NISSAN MOTOR CO., U.S.A.