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GMC Truck
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1998
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Yukon 4WD V8-5.7L VIN R
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Description and Operation
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Thermostat Description
Thermostat Description
The
cooling system
uses a wax pellet-type thermostat. The thermostat performs the following functions:
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Controls the flow of coolant
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Provides fast engine warm-up
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Regulates the coolant temperature