1. Thermostat; 2. Rubber ring; 3. Outlet pipe; 4. Radiator hose (upper); 5. Heater hose; 6. Heater tube; 7. Copper washer; 8. Engine coolant temperature sensor; A. To the radiator; B. To the heater core
Removal
1. Drain the coolant.
Caution: Drain the coolant when it is cold. Do not remove the radiator cap when the engine is hot. High-pressure coolant escaping from the radiator can cause severe burns.
2. Remove the air duct and air cleaner housing. See chapter Mechanical part of the engine.
3. Disconnect the radiator hose (upper).
4. Remove the inlet manifold and thermostat.
When removing, the coolant remaining in the engine will spill out. Collect it in a container.
5. If necessary, remove the engine coolant temperature sensor.
6. If necessary, disconnect the heater pipe.
Check after removal
Tie a string so that it is secured to the thermostat valves. Completely immerse them in a container of water. Heat by shaking (the figure shows a thermostat as an example).
The valve opening temperature is the temperature at which the valve opens and falls off the thread.
Continue heating. Check the lift height when fully opened.
After checking the lift height at full opening, reduce the water temperature and check the valve closing temperature.
If abnormalities are observed when the valve closes at normal temperature or the measured values differ from the normal, replace the thermostat.
Standard values
| Valve opening temperature | 86,5-89,5°C |
| Lifting height at full opening | In mm or more 101°C |
| Valve closing temperature | 83°C |
Installation
Installation is carried out in the reverse order of removal, taking into account the following:
Installing a thermostat
1. Install the thermostat so that the flange parts are securely fixed around the entire perimeter inside the rubber ring.
2. Install the thermostat with the vibration valve facing up, as shown in the figure.
Note: Do not allow the vibration valve to become jammed.
Installing the exhaust pipe
Install the outlet pipe upwards.
Replace the thermostat.
Installing the heater tube
Apply thread sealant to the threads and screw in.
Use brand name sealant or equivalent.
Post-installation check
Check for engine coolant leaks using a radiator cap adapter (special tool: EG17650301) and the pump (suitable tool) (models without air conditioning) or using a pump and an adapter for the tank lid (models with air conditioning).
Start the engine and warm it up to normal operating temperature. Conduct a visual inspection to ensure there are no coolant leaks.
Data taken from this portal: Nissanbook.ru