F 350 4WD Pickup V8-351 5.8L VIN H EFI (1997)
Thermostat: Description and Operation
A poppet-type water thermostat is used.
When the water thermostat is closed, coolant flows to the water pump through a bypass passage at the front of the engine. When the water thermostat is
open, coolant flows through the coolant outlet elbow (thermostat housing) to the radiator.
The water thermostat used in production is a high-temperature water thermostat for use with a mixture of water and permanent-type antifreeze. A
low-temperature water thermostat should be installed if a non-permanent type antifreeze and water coolant solution is used.
