Diagnostic Procedure

CHECK COOLING SYSTEM FOR LEAK
Apply pressure to the cooling system with a tester, and check if the pressure drops.

Testing pressure :157 kPa (1.6 kg/cm ² , 23 psi)

CAUTION: Higher than the specified pressure may cause radiator damage. Pressure should not drop.

OK or NG
1. OK: GO TO 2.
2. NG: Check the following for leak.
  - Hose
  - Radiator
  - Water pump
    Refer to "WATER PUMP .
    
    Fig 1: Checking Cooling System For Leak
    Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK RADIATOR CAP
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 3.
2. NG: Replace radiator cap.
CHECK THERMOSTAT
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 4.
2. NG: Replace thermostat.
CHECK ENGINE COOLANT TEMPERATURE SENSOR
Refer to COMPONENT INSPECTION .

OK or NG
1. OK: GO TO 5.
2. NG: Replace engine coolant temperature sensor.
CHECK MAIN 11 CAUSES
If the cause cannot be isolated, go to MAIN 11 CAUSES OF OVERHEATING .
1. INSPECTION END
Perform FINAL CHECK by the following procedure after repair is completed.
1. Warm up engine. Run the vehicle for at least 20 minutes. Pay attention to engine coolant temperature gauge on the instrument panel. If the reading shows an abnormally high temperature, another part may be malfunctioning.
2. Stop vehicle and let engine idle. Check the intake and exhaust systems for leaks by listening for noise or visually inspecting the components.
3. Allow engine to cool and visually check for oil and coolant leaks. Then, perform "Overall Function Check".