Quote Originally Posted by dom14 View Post
The hose I attached the sensor in above picture goes to the heater core/LPG converter. The coolant line the hose joins comes directly out of the engine block water jacket behind the thermostat(not after it). The thermostat hose in the picture carries "cold" water from the bottom hose of the radiator. So, it's lot "colder" than the coolant outside the thermostat until the thermostat opens.
I thought that the thermostat controlled the hot water leaving the engine into the top of the radiator to be cooled then pumped from the bottom of the radiator through the block (pump assisted thermo syphon).