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