2004 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE

With GST

  1. Check the coolant level in the reservoir tank and radiator.

    Allow engine to cool before checking coolant level.Β 

    If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps and go to "DIAGNOSTIC PROCEDUREΒ ".

  2. Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps and go to "DIAGNOSTIC PROCEDUREΒ ".
  3. Start engine.

    Be careful not to overheat engine.Β 

  4. Set temperature control lever to full cold position.
  5. Turn air conditioner switch ON.
  6. Turn blower fan switch ON.
  7. Run engine at idle for a few minutes with air conditioner operating.

    Be careful not to overheat engine.Β 

    Fig 1: Turning Blower Fan Switch On
    G00778217Courtesy of NISSAN MOTOR CO., U.S.A.
  8. Make sure that cooling fan operates at low speed.

    If NG, go to "DIAGNOSTIC PROCEDUREΒ ".

    If OK, go to the following step.

  9. Turn ignition switch OFF.
  10. Turn air conditioner switch and blower fan switch OFF.
  11. Disconnect engine coolant temperature sensor harness connector.
  12. Connect 150Ξ© resistor to engine coolant temperature sensor harness connector.
  13. Restart engine and make sure that cooling fan operates at higher speed than low speed.

    Be careful not to overheat engine.Β 

  14. If NG, go to "DIAGNOSTIC PROCEDUREΒ ".
    Fig 2: Connecting Resistor To Engine Coolant Temperature Sensor Harness Connector
    G00778218Courtesy of NISSAN MOTOR CO., U.S.A.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.