Features 1. OE Number: The heater control water valve references OE numbers 4H0121671D and 4H0121671B, designed based on original specifications. 2. Fitment: This AC heater cooling solenoid valve fits A3, A4, Allroad, A5, A6, A7, Q3, Q5, Q7, Q8, RS6, RS7, Sportback, RSQ8, S3, S6, S7, S8 models. 3. Function: Regulates the flow of hot coolant into the heater core for precise cabin temperature control. 4. Energy Efficient: Helps optimize coolant flow to improve energy efficiency and reduce fuel consumption. 5. Ideal Replacement: Direct replacement with original-style design, meeting or exceeding OEM standards for replacing worn or damaged units. Specification Item Type: Heater Control Water Valve OE Number: 4H0121671D, 4H0121671B Material: Metal Fitment: Fits A3 20152020 Fits A4 20182020 Fits A4 Allroad 20182020 Fits A5 20182020 Fits A5 Sportback 20182020 Fits A6 20122018 Fits A7 20142018 Fits A8 20112021 Fits Allroad 20132016 Fits Q3 20152018 Fits Q5 20132019 Fits Q7 20132022 Fits Q8 20192022 Fits RS6 20212022 Fits RS7 20142018 Fits RS7 Sportback 20212022 Fits RSQ8 20202022 Fits S3 20152020 Fits S6 20132018 Fits S7 20132018 Fits S8 20132021 Fits SQ7 20202022 Fits SQ8 20202022 Fits TT 20162018 Fits TTS 20162018 Package List 1 x Heater Control Water Valve