2. Check the operation of the thermostat valve. To do this, bind the thermostat (A) so that it does not interfere with the opening of the valve (1), then place the thermostat in a tank of water (IN) and heat up. By controlling the water temperature with a thermometer, check the main parameters of the thermostat.
Gasoline engines
diesel engine
Note. All reference values are given below.
If the valve is not in the correct position at room temperature, or if the test results do not match the given specifications, then it must be replaced with a new one.