Thermostat (Escort 5)

Removal

Remove the negative terminal from the battery. Drain the coolant from the cooling system.

Engines and HCS, Endura-E, CVH and PTE

Loosen the clamps and remove the hoses of the upper radiator tank, expansion tank and heater from the thermostat housing (see Fig. 3.3, 3.4).





Remove the connector from the fan switch temperature sensor. Unscrew the bolts and remove the thermostat housing (see Fig. 3.5.).



Remove the gasket from the front surface of the thermostat housing, then use pliers to squeeze and remove the thermostat retaining ring. Remove the thermostat from the housing and remove the O-ring (see Fig. 3.6-3.8).









Zetec and Zetec-E engines.
Remove the expansion tank and upper radiator tank hoses from the thermostat housing.

Unscrew the mounting bolts and remove the water outlet pipe from the thermostat housing (see Fig. 3.9).



Remove the thermostat from the housing, noting its position.

General control of the cooling system

If there are any defects in the cooling system, check the coolant level, the tension of the auxiliary drive belt and the functionality of the temperature gauge.

If the engine warms up very slowly after starting, it is possible that the thermostat is in a permanently open position and needs to be replaced.

If the engine overheats, check the temperature of the upper radiator hose with your hand. If the hose is cold, then the thermostat may be in the closed position and not allowing coolant to pass to the radiator. In this case, the thermostat must also be replaced.

Checking the Thermostat

If the thermostat is in the open position at room temperature, it must be replaced.

To check the thermostat, lower it on a string into a container of water. Gradually heat the water and measure the temperature at which the thermostat begins to open and opens completely. Remove the thermostat from the water and check that it closes completely after cooling. Replace the thermostat if its parameters differ from the technical requirements (see Fig. 3.10).

Installation (all models)

Installation is performed in the reverse order of removal. Clean the mating surfaces and replace the thermostat O-ring and housing gasket (see Fig. 3.11).





On Zetec and Zetec-E engines, install the thermostat with the valve on top (see Fig. 3.12).



Tighten the thermostat housing mounting bolts to the specified torque Fill the cooling system with coolant Start and warm up the engine to operating temperature Check the cooling system for leaks and the operation of the thermostat.

(A copy of the article is available on the website FordBook.ru)