BEHR ThermostatIntegral VW 2.0L CBEA and CJAA Engines

The Mahle TI3387 is an engine thermostat designed to maintain optimal engine operating temperature. It functions as a valve, closing when the engine is cold to allow internal circulation and opening when the engine reaches its operating temperature to permit coolant flow to the radiator. This ensures the engine warms up efficiently and prevents overheating.

When a thermostat fails, it can cause various issues, including overheating if stuck closed, or the engine failing to reach optimal temperature if stuck open. Partial opening or incomplete closing can lead to excessive fuel consumption and increased tailpipe emissions. Replacing a failed thermostat is crucial for restoring peak engine efficiency. It is also recommended to replace the thermostat if other cooling system components have failed due to overheating, as the excessive heat may have damaged it.