Parts & Accessories Spare parts This part is a Heater Control Valve for Mercedes-Benz cars, specifically classic models like the W126 (older S-Class). This part is manufactured by Bosch, and its primary function is to regulate the flow of hot coolant from the engine to the cabin's heater radiator to control the hot AC temperature. Part Details Based on the numbers shown in the picture, here are the specifications: Manufacturer: Bosch. Part Number (Mercedes): 000 830 37 84. Bosch Number written below: 1 147 412 012. Voltage: 12 Volts (12V). Condition in the picture: Appears to be an original used part, and it is a single valve type. 🚗 Compatible Cars This part is commonly used in Mercedes models from the 1980s and early 1990s, including: W126: such as 300SE, 300SEL, 420SEL, 500SEL, 560SEL.