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Home >> Nissan-Datsun >> 1993 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Radiator Cooling Fans (Except 240SX) >> Radiator (Cooling) Fan Control Test (Quest With A/C)

Radiator (Cooling) Fan Control Test (Quest With A/C)

  1. Start engine and warm to operating temperature. Set temperature lever to full cold. Turn A/C switch on. Turn fan switch on. Run engine at idle with A/C on for several minutes. Ensure radiator fan operates at low speed. If radiator fan does not operate at low speed, go to RADIATOR (COOLING) FAN LOW SPEED CONTROL TEST (QUEST). If radiator fan operates at low speed, go to next step.
  2. Turn A/C and fan switches off. Turn ignition off. Disconnect radiator fan relays No. 1 and No. 2. See Figure and Figure . Start engine and idle until engine temperature is above 221°F (105°C). Ensure radiator fan operates at high speed. Reconnect radiator fan relay No. 2. Disconnect radiator fan relay No. 3. Start engine and idle until engine is above 221°F (105°C). Ensure radiator fan operates at high speed. If radiator fan does not operate at high speed in either test, see RADIATOR (COOLING) FAN HIGH SPEED CONTROL TEST (QUEST). If radiator fan operates at high speed, system is functioning properly.
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