Thanks for your answer. I also checked the shop manual. On page 4-8 (specifications) the shop manual mention three types of thermostats, low- and high temperature thermostats and a “Cylinder Block thermostat”. The last type, is that a different type of thermostat? The 180 degree thermostat, is this the “high temperature” thermostat that opens at a temperature of 175 -180 degree and is fully open at 200 degree?