381849 Thermostat 170° For Caterpillar PAI Replaces CAT4W4011

It is a Caterpillar thermostat 170° unit, designed to begin opening at 170°F to help control operating temperature. As an engine coolant thermostat, it supports stable coolant flow once the engine reaches its target range. Proper temperature regulation can help protect cooling-system components and maintain consistent performance.

Yes, it is intended as a CAT 4W4011 replacement thermostat for compatible Caterpillar applications. This makes it a practical option when sourcing Caterpillar engine parts that cross-reference to 4W4011. Always confirm engine fitment by part number and application before installation.

Common signs include overheating, running cooler than normal, slow warm-up, or inconsistent temperature readings. A thermostat that sticks closed can restrict coolant flow, while one that sticks open may prevent the engine from reaching proper operating temperature. When diagnosing, inspect coolant level/condition and verify the thermostat’s opening behavior; using PAI replacement parts can restore correct regulation when the thermostat is confirmed faulty.