| 1. Remove the thermostat from the car. |
| 2. Ship the thermostat and the control thermometer in the glass container with cooling liquid so that they did not concern a bottom and walls of a vessel (it can lead to distortion of indications). |
| 3. Establish capacity on an electric tile and increase temperature of cooling liquid, monitoring indications of the thermometer and movement of the valve of the thermostat. It has to begin to open at a temperature of liquid about 88 °C and to open completely at a temperature of 92 °C. |
| 4. Replace the thermostat if it does not satisfy at least to one of requirements of check. |