Genuine thermostat unit OE for BMW models — includes thermostat with housing. Regulates coolant flow and engine temperature to prevent overheating and ensure optimal performance. Fits N20/N26 2.0 L engines in BMW 1 Series, 2 Series, 3 Series, 4 Series, X1, X3 and others (always verify engine code & VIN). Ideal replacement when thermostat fails or causes overheating. Durable OEM‐grade part built for reliability. Nationwide delivery available.