Checking and removing the thermostat in a Ford Focus 2 car

Instruments:

• Sliding pliers
• socket wrench
• socket for socket wrench 8

Parts and consumables:

• Rubber o-ring thermostat
• Coolant
• Vessel with water
• Engine thermostat
• Accessory drive belt
• Rubber gasket

Notes:

We check the thermostat in case of violation of the thermal regime of the engine, that is, when the engine overheats or the coolant temperature does not reach the standard values. The performance of the thermostat can be evaluated on the car.

Let's start a cold engine. The valve of a working thermostat must be closed and the coolant must circulate in a "small" circle, bypassing the radiator of the cooling system. At the same time, the inlet and outlet hoses of the radiator will remain cold for some time.

As the engine warms up, when the coolant temperature reaches 82 ° C, the radiator hoses should heat up quickly, indicating that the thermostat is working and the coolant has begun to circulate in a “big” circle.
If this does not happen, then the thermostat should be removed from the engine for inspection and possible replacement.

The thermostat is housed in a plastic case, which is located at the front of the engine block under the alternator.
Either the alternator or the intake manifold must be removed to access the thermostat housing bolts.

Checking and removing the thermostat Ford Focus 2

1. We merge a cooling liquid and we remove the generator or the inlet pipeline. For greater clarity, we show further work with the generator removed.

2. With pliers, in turn, we compress the ends of the spring clamps that secure the cooling system hoses suitable for the thermostat housing, and move the clamps in the direction away from the thermostat housing.

3. Remove the hoses from the nozzles of the Ford Focus 2 thermostat housing.

4. With a head of 8, unscrew the 4 bolts securing the thermostat housing to the cylinder block.

5. Remove the thermostat housing.

6. A replaceable rubber gasket is used to seal the joint between the thermostat housing and the cylinder block. Remove the thermostat from the plastic case.

7. Remove the rubber sealing ring from it. If it is damaged or has lost elasticity, replace it with a new one.

8. To check the thermostat removed from the engine, lower it into a vessel with water. We heat the vessel, while stirring the water and controlling the moment the thermostat valve opens with a thermometer. The valve stem should begin to extend at 82°C and the thermostatic valve should open fully at 97°C. Both temperature values ​​are indicated on the thermostat flange.

9. If the thermostat is defective, replace it with a new one, and then install it on the engine in reverse order.
We tighten the bolts of the thermostat housing evenly crosswise with a torque of 9.0 Nm. After completion of work, add liquid to the cooling system and remove air from it.

Note:

When removing the alternator, the auxiliary drive belt must be replaced with a new one! Replace the thermostat housing seals with new ones each time it is removed.

The article is missing:

• High-quality repair photos

Source: http://wiki.zr.ru/118-1_%D0%A0%D0%B5%D0%BC%D0%BE%D0%BD%D1%82_Ford_Focus_II.