Mitsubishi Galant

1. Before finally affirming as opinion on a thermostat exit out of operation, check level of cooling liquid in system, a condition and effort of a tension of a driving belt (see. Head of Control and routine maintenance), and also serviceability of functioning of a measuring instrument / control lamp of temperature.
2. One of the possible reasons of too slow warming up of the engine (according to measuring instrument indications) is thermostat jamming in open situation. Replace the thermostat new.
3. In case of an overheat of the engine touch a hand the bottom hose of a radiator. If the hose is not heated up, possibly, the thermostat is jammed in a closed position, blocking circulation of cooling liquid through a radiator. Replace the thermostat.

At all do not maintain the car with the removed thermostat, - feedback of the onboard processor that will lead to increase of toxicity of the fulfilled gases and excessive increase in fuel consumption thus can become torn.

4. If the bottom hose is heated up, it means that cooling liquid regularly circulates through a radiator, i.e. the thermostat is open. Address to materials of the Section devoted to diagnostics of malfunctions of system of cooling.
5. Thermostat check on a workbench gives the most exact results.
6. Remove the thermostat from the engine (see. Head Engine).
7. Tie up to thermostat assembly a piece of a wire and lower it in the capacity filled with water. There lower the thermometer.

Track, that the thermometer and the thermostat did not adjoin to walls and a capacity bottom.

8. Start to warm up slowly water, watching change of indications of the thermometer, - operation of the valve of the thermostat should occur in strict accordance with requirements of Specifications.
9. Estimate size of complete opening of the valve, - the nominal rate makes 8 mm.
10. The description of procedures of removal and installation of the thermostat is provided in the Section Removal and thermostat installation.