Genuine OEM Volkswagen Charging Coolant Thermostat, part number 04C121113B. This precision component is crucial for managing engine temperatures by regulating the flow of coolant, specifically for the charging system (e.g., turbocharger or intercooler). It ensures the charging coolant reaches and maintains its optimal operating temperature, contributing to engine efficiency and longevity. Weighing approximately 0.059 kg, this thermostat is designed for accurate temperature sensing and reliable valve operation. Choosing a genuine OEM thermostat guarantees precise calibration, proper opening and closing temperatures, and durable construction for consistent engine thermal management.