Malfunctions thermostat

The thermostat does not open, if it is jammed or stuck valve. In this case, even if the temperature indicator is already in the red zone, the radiator remains cold. Wait until the engine has cooled, then unscrew the thermostat housing and remove it. Some time you can drive without a thermostat - it will not harm the engine. Operating a vehicle with a faulty thermostat may lead to serious engine damage. So, can burn head gasket, cylinder head can deform or even get a crack.

The thermostat does not close completely, if the foreign body is horrible. A symptom of this problem is, for example, the heating radiator immediately after a cold start. The engine warms up very slowly. It should be as soon as possible to replace the thermostat as its failure leads to increased fuel consumption and can damage the engine, which is not prgrevaetsya to operating temperature.