Genuine OEM Audi Heating Control Valve Solenoid, part number 4H0121671D. This solenoid valve is a key component in the vehicle's heating and air conditioning (HVAC) system, responsible for regulating the flow of hot coolant to the heater core. By precisely controlling this flow, it allows for accurate adjustment of the cabin temperature, ensuring passenger comfort. The valve features an electrical connector for control signals and hose connections for the coolant lines. Weighing approximately 0.56 kg, it is designed for integration into the engine cooling and heating circuit. Choosing a genuine OEM solenoid valve ensures correct electrical calibration, fluid flow characteristics, and long-term reliability, which are critical for consistent climate control performance.

Catalogue entry: VALVE.