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(888) 312-8812 Login SignupRegulate your engine's operating temperature with the precision-calibrated Cummins Engine Coolant Thermostat. This genuine component stays closed during cold starts to help the engine reach its peak efficiency temperature faster, which reduces internal wear and improves fuel economy. When the load gets heavy, the Cummins 3917324 opens at a specific thermal threshold to ensure a full flow of coolant to the radiator. Replacing a sticking or slow thermostat is one of the easiest ways to prevent a high-temp de-rate or a cracked cylinder head.
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