Charger V8-5.7L VIN H (2007)
Thermostat: Description and Operation
Operation
GAS ENGINE
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.
3.0L DIESEL ENGINE
WARM-UP PHASE
Up to a coolant temperature of approximately 87° C (189° F), the main valve is closed and the bypass valve fully open. The flow through the radiator is
interrupted and coolant flows through the bypass passage directly to the inlet side of the water pump.
PARTIAL-LOAD PHASE
The main valve begins to open at a coolant temperature of 86° C (189° F), and a small amount of coolant flows through the radiator. As the engine
temperature increases, the main valve opens further and the bypass valve gradually closes. More coolant flows through the radiator and less coolant
flows through the bypass passage.
FULL-LOAD PHASE
