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.
   Fig 1: Monitoring Cooling Fan In Active Test Mode

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

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/cm2  , 23 psi)

OK or NG

1. OK: Go to 5.
2. NG: Check the following for leak. Refer to LEVEL CHECK .
   • Hose
   • Radiator
   • Water pump
Fig 2: Checking Cooling System For Leak
Courtesy of NISSAN MOTOR CO., U.S.A.

Apply pressure to cap with a tester.

Fig 3: Applying Pressure To Cap With A Tester

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

1. Radiator cap relief pressure: 59 - 98 kPa (0.6 - 1.0 kg/cm2  , 9 - 14 psi)

OK or NG

1. OK: Go to 6.
2. NG: Replace radiator cap.

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 .

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