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By Steve Schaeber, MACS Technical Editor The main purpose of a thermostat is to help the cooling system regulate engine operating temperatures to within the manufacturer’s specification. This is normally…

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Thermostats open and close with changes in engine temperature, and sometimes become stuck. If stuck open, the engine never warms up properly and there is little or no heat from the heater. A stuck-open thermostat can also be a cause of poor fuel economy.
Stuck closed, a failed thermostat can cause engine overheating because the coolant

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