Fig. 5.60. Thermostat: 1 – radiator outlet hose; 2, 6, 8 – clamps; 3 – thermostat housing mounting bolts; 4 – thermostat housing sealing gaskets; 5 – thermostat housing; 7 – hose to the water jacket outlet pipe; 9 – liquid hose of the expansion tank.
The need to replace the thermostat may arise when the engine temperature is unstable: overheating or insufficient warming up.
To check the thermostat on the car, start the cold engine and touch the right (outlet) hose 1 (Fig. 5.60) of the radiator with your hand – it should be cold. After the coolant temperature reaches 60°C, the hose should begin to heat up quickly, which indicates that the liquid has begun to circulate through the large circuit. If this does not happen, and the coolant temperature sensor and engine control unit are in good working order, replace the thermostat.
You will need: a 10 mm socket head and sliding pliers.
1. Disconnect the wire from the negative terminal of the battery.
2. Drain the fluid from the engine cooling system (see Replacing the coolant).
3. Remove the generator (see Removing and installing the generator).
4. Using sliding pliers, loosen the clamps, slide them along the hoses and remove the hoses from the thermostat housing pipes.
5. Disconnect the wiring harness connector from the thermostat by squeezing its fastening clamp.
6. Unscrew the four bolts 3 (see Fig. 5.60) securing the thermostat housing to the cylinder block and remove the thermostat.
7. Install the parts in the reverse order of removal. Tighten the thermostat housing mounting bolts evenly crosswise to a torque of 9 N·m (0.9 kgf·m).
8. Fill the engine cooling system with liquid and remove air from it (see Replacing the coolant).
(The original article is available on the website: fordbook)