Pic. 2.215. Removing the thermostat: 1 - bypass hose; 2 - bottom hose; 3 - thermostat assembly; 4- thermostat mounting bolts
Tie the thread so that it is secured to the working parts of the thermostat. Completely submerge the thermostat in a container of water. Warm up by shaking (pic. 2.215).
Pic. 2.216. Immersing the thermostat in a container of water
The valve opening temperature is the temperature at which the valve opens and falls off the string (pic. 2.216).
Keep heating. Check lift height when fully opened.
After checking the lift height at full opening, lower the water temperature and check the valve closing temperature.