Navistar International DT 466 Diagnostic/Troubleshooting Manual page 46

42
Figure 35 Thermostat open
1. Coolant out to radiator
2. Coolant flow to heater port
3. Coolant in from engine
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
1 ENGINE SYSTEMS
When coolant temperature reaches the nominal
opening temperature (88 °C [190 °F]) the thermostat
opens allowing some coolant to flow to the radiator.
When coolant temperature exceeds 96 °C (205 °F),
the lower seat blocks the bypass port directing full
coolant flow to the radiator.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.