Procedure A

Do you have CONSULT-II?

Yes or No 

1. Yes: GO TO 2.
2. No: GO TO  3 .

WITH CONSULT-II 

1. Start engine and let it idle.
2. Select "COOLING FAN" in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that cooling fans-1 and -2 operate at each speed (LOW/MID/HI).

OK or NG 

1. OK: GO TO  4 .
2. NG: Check cooling fan control circuit. (Go to "PROCEDURE B  ".)

Fig 1: Active Test Scan Tool Display

Courtesy of NISSAN MOTOR CO., U.S.A.

Without CONSULT-II 

1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to "AUTO ACTIVE TEST ".
2. Make sure that cooling fans-1 and -2 operate at each speed (Low/Middle/High).

OK or NG 

1. OK: GO TO 4.
2. NG: Check cooling fan control circuit. (Go to "PROCEDURE B  ".

Apply pressure to the cooling system with a tester, and check if the pressure drops.

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

Fig 2: Applying Pressure To The Cooling System With Tester

Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 5.
2. NG: Check the following for leak. Refer to "LEVEL CHECK ".
   • Hose
   • Radiator
   • Water pump

Apply pressure to cap with a tester.

1. Radiator cap relief pressure: 59-98 kPa (0.6-1.0 kg/cm ²  , 9-14 psi) 

OK or NG 

1. OK: GO TO 6.
2. NG: Replace radiator cap.

Fig 3: Applying Pressure To Cap With Tester

Courtesy of NISSAN MOTOR CO., U.S.A.

1. Check valve seating condition at normal room temperatures. It should seat tightly  .
2. Check valve opening temperature and valve lift.
   1. Valve opening temperature: 76.5°C (170°F) [standard] 
   2. Valve lift: More than 8.6 mm/90°C (0.339 in/194°F) 
3. Check if valve is closed at 5°C (9°F) below valve opening temperature.

   For details, refer to "WATER INLET AND THERMOSTAT ASSEMBLY ".

   Fig 4: Checking Valve Opening Temperature And Valve Lift

   Courtesy of NISSAN MOTOR CO., U.S.A.

OK or NG 

1. OK: GO TO 7.
2. NG: Replace thermostat

Refer to "COMPONENT INSPECTION  ".

OK or NG 

1. OK: GO TO 8.
2. NG: Replace engine coolant temperature sensor.

If the cause cannot be isolated, go to "MAIN 12 CAUSES OF OVERHEATING  ".

1. : INSPECTION END