In the presence of malfunction in cooling system at first check level of cooling liquid in a broad tank, a tension of an auxiliary driving belt of the pump of cooling liquid and operability of the index of temperature.

If after start the engine gets warm very slowly, probably the thermostat is in constantly open situation. It is possible to define it, having checked a branch pipe going from the thermostat to a radiator. If it теплеет right after engine start - means the thermostat is open. In this case it is necessary to replace it.

If the engine overheats, a hand check temperature of the top hose of a radiator. If the index of temperature issues indications at which the thermostat should open, and a hose cold, that, probably, the thermostat is in a closed position and does not pass cooling liquid to a radiator. In this case the thermostat also is subject to replacement.