The thermostat is replaced in case of violation of the thermal regime of the engine, when the engine either overheats (the thermostat valve is stuck in the closed position) or does not heat up enough (the thermostat valve is stuck in the open position).

When checking the thermostat on a car after starting a cold engine, the bottom hose from the radiator should remain cold for some time, and then (after the coolant temperature reaches 89˚ C) heat up quickly, which indicates the beginning of the circulation of the coolant in a large circle .

To dismantle the thermostat, drain the coolant (article - Checking and replacing the Renault Duster engine coolant ).

We show the removal of the thermostat on the F4R engine, on the K4m engine we remove the thermostat in the same way.

Removing thermostat and thermostat housing Renault DusterRemoving thermostat and thermostat housing Renault Duster

Without disconnecting the hoses from the nozzles of the thermostat cover, with a head of 10, unscrew the three bolts securing the thermostat cover (the supply hose is removed for clarity)

Remove the cover from the thermostat housing

Removing thermostat and thermostat housing Renault DusterRemoving the Renault Duster thermostat and thermostat housing

Remove the thermostat from the socket in the housing

The connection of the thermostat to the housing and cover is sealed with a rubber gasket.

If the gasket is damaged or has lost its elasticity, it must be replaced with a new one.

To check the thermostat, we lower it into a vessel with water.

We heat the vessel, while stirring the water and controlling the beginning of the opening of the thermostat valve with a thermometer.

Removing thermostat and thermostat housing Renault Duster

The valve stem should begin to extend at 89°C, indicated by the number 89 on the end of the thermostat bottle

At a temperature of 95±2˚С, the valve should open completely - the stem stroke should be at least 8 mm.

Install the thermostat in reverse order.

Pour liquid into the cooling system and bring the liquid level in the reservoir to normal.

Removing the water distributor

We remove the water distributor to replace the sealing gasket in the connection of the cylinder head with the flange of the thermostat housing, as well as when repairing the cylinder head.

Draining the coolant from the cooling system

Remove the thermostat as described above.

Remove the air intake and the engine air path resonator.

Removing thermostat and thermostat housing Renault DusterRemoving thermostat and thermostat housing Renault Duster

Disconnect the wiring harness block from the coolant temperature sensor

Using the blade of a flathead screwdriver to pry the plastic bracket of the wiring harness

Removing thermostat and thermostat housing Renault DusterRemoving thermostat and thermostat housing Renault Duster

We take out the piston 2 from the hole 1 of the thermostat housing (shown with the gearbox removed)

Using an 8 spanner wrench, unscrew the bolt that secures the bracket for the heater hoses of the wiring harness to the thermostat housing.

Removing thermostat and thermostat housing Renault DusterRemoving thermostat and thermostat housing Renault Duster

We compress the ends of the fastening clamp with sliding pliersi of the hose for supplying fluid to the heater radiator, move the clamp along the hose and remove the hose from the nozzle of the thermostat housing

With a head of 8, unscrew the nine bolts securing the thermostat housing to the cylinder head

Removing thermostat and thermostat housing Renault DusterRemoving thermostat and thermostat housing Renault Duster

Removing the water distributor

Remove the gasket

Removing thermostat and thermostat housing Renault Duster

In the body and the gasket there are channels for oil and coolant.

Removing thermostat and thermostat housing Renault Duster

We install a new gasket and tighten the nine bolts in the sequence shown in the figure.

Tightening torque - 10 Nm.