30.1
DESCRIPTION AND OPERATION OF COOLANT THERMOSTAT
Thermostat Operating Modes
The coolant from the radiator and the radiator bypass mix in the thermostat housing. The
thermostat regulates the temperature of this mixed
fl
ow circuit.
Three different operating conditions occur due to the coolant mixed
fl
ow temperature:
□
Bypass mode:
When the coolant mixed
fl
ow temperature is below 87°C (188°F), the
circulating thermostat is closed. The coolant circulates through the radiator bypass to the
coolant thermostat. None of the
fl
ow passes through the radiator.
□
Mixed mode:
For a coolant mixed
fl
ow temperature above 87°C (188°F) to and less than
95°C (203°F), the circulating thermostat opens partially and the coolant
fl
ows at the same
time through the engine radiator and the radiator bypass to the coolant thermostat .
□
Radiator operation:
When the coolant inlet temperature is above 95°C (203°F) the
circulating thermostat is completely open. The coolant
fl
ows through the radiator to the
coolant thermostat. None of the
fl
ow passes through the radiator bypass.
Other minor coolant loops exist in addition to those described above. The
fl
ow through these
loops are unaffected by the position of the coolant thermostat. These loops include the
fl
ow
through the vehicle cab heater, vehicle bunk heater, the EGR actuator, and the doser.
All information subject to change without notice.
30-4
DDC-SVC-MAN-0081 2010
Copyright © 2010 DETROIT DIESEL CORPORATION
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