TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
0003 00
OIL COOLERS AND COOLING SYSTEM OPERATION - CONTINUED
N OT E
The water temperature regulator is an important part of the cooling system. The water temperature regula-
tor divides the coolant flow between radiator and bypass. Normal operating temperature is maintained. If
the water temperature regulator is not installed in the system, the flow of coolant is not regulated. Most of
the coolant will bypass the radiator. The engine, the transmission, and the hydraulic oil may overheat dur-
ing high ambient temperatures.
b.
When coolant temperature is below 178F (81C), water regulator will be closed. Path for coolant return to radia-
tor is blocked. Coolant flows through bypass and back to water pump.
c.
As coolant temperature reaches 181 2F (83 1C), water temperature regulator begins to open. Coolant begins
to flow to radiator. When coolant temperature reaches 198F (92C), coolant is at normal operating temperature.
Water temperature regulator is fully open and flow of coolant to bypass is blocked. Path for coolant to radiator is
open. Temperature of returned coolant will be reduced as coolant flows through radiator.
0003 00-62
