PREVENTION When opening a cover of a radiator on the hot engine be careful, as leaving pairs can lead to strong burns. Close a radiator cover a thick layer of a fabric and slowly unscrew a cover to a hissing sound. After the hissing termination slowly turn on and uncover a radiator.

Check of the thermostat established on the car

Before check of the thermostat check level of cooling liquid, a tension of a belt of a drive of the water pump and operability of the sensor of temperature.

If after start of the cold engine it gets warm very long, probably, the thermostat is constantly open and cooling liquid circulates on a big circle. In this case replace the thermostat.

If the engine overheats, a hand check temperature of the bottom hose of a radiator. If the hose cold, probably, the thermostat is constantly closed and cooling liquid constantly circulates on a small circle. In this case also replace the thermostat.

If the bottom hose of a radiator hot, it testifies that the thermostat is open and cooling liquid passes through a radiator. In this case it is necessary to address on service station for search and elimination of the reason of an overheat of the engine.

Check with thermostat removal

Remove the thermostat.

Fig. 4.1. Thermostat: 1–secondary spring; 2–frame; 3–valve; 4–valve saddle; 5–flange; 6–plunzher; 7–adjusting pin; 8–main spring

Appearance of the thermostat is shown on fig. 4.1 .

Fig. 4.2. Check of opening of the valve of the thermostat in a vessel with hot water

Previously to check operability of the thermostat it is possible so: suspend it on a thread in the glass vessel filled with water, and heat up water to boiling (fig. 4.2) . When boiling water the valve of the thermostat should open. Otherwise replace it.

The temperature of opening of the valve of the thermostat is written on its case.

The thermostat, which valve is not closed when cooling water, is also faulty and is subject to replacement.

Thermostat replacement

Switch off ignition and disconnect a "weight" wire from the storage battery.

Merge cooling liquid from a radiator. Disconnect a radiator hose from a thermostat casing.

Fig. 4.3. Otvorachivaniye of nuts of fastening of a casing of the thermostat on release cars till 2001

On release cars till 2001 remove a thermostat casing from a back part of the case of the water pump (fig. 4.3) . For simplification of access to the bottom nut of fastening of a casing of the thermostat it is recommended to remove the oil filter.

Fig. 4.4. An arrangement of nuts of fastening of a casing of the thermostat on release cars since 2001

On release cars since 2001 remove the generator and unscrew nuts of fastening of a casing of the thermostat (fig. 4.4) .

Remove the thermostat, having remembered situation in which it was established.

Establish on the thermostat a new sealing ring and clear privalochny surfaces of a casing of the thermostat.

On release cars till 2001 establish the thermostat in a thermostat casing. Then establish a casing with the thermostat in a back part of the water pump so that the adjusting pin settled down from above.

Fig. 4.5. At thermostat installation, the adjusting pin should settle down from above

On release cars since 2001 establish the thermostat in a nest of the block of cylinders so that the adjusting pin settled down from above (fig. 4.5) .

Nuts fix a casing of the thermostat and establish other elements which have been removed earlier.

Fill in cooling liquid.

Get the engine and be convinced of absence of leaks.