Caravan FWD V6-3.3L VIN R (2001)
Thermostat: Description and Operation
DESCRIPTION
The engine cooling thermostats are a wax pellet driven, reverse poppet choke type. The thermostat is mounted in a housing on the coolant outlet of the
engine or.
OPERATION
The engine cooling thermostat is a wax pellet driven, reverse poppet choke type. The thermostat is designed to provide the fastest warm up possible by
preventing leakage through it and to guarantee a minimum engine operating temperature of 88 to 93°C (192 to 199°F). The thermostat also will
automatically reach wide open so it will not restrict flow to the radiator as temperature of the coolant rises in hot weather to around 104°C (220°F).
Above this temperature the coolant temperature is controlled by the radiator, fan, and ambient temperature, not the thermostat.
The thermostat is operated by a wax filled container (pellet) which is sealed. When heated coolant reaches a predetermined temperature, the wax
expands enough to overcome the closing spring and water pump pressure, which forces the valve to open.
