BMW e46 e53 e83 e85 e86 (A/T) Expansion Tank Thermostat coolant valve OEM Expansion Tank Thermostat Only for Cars with Automatic Transmission Brand NEW part with full 1 year warranty. BMW part# 17 11 1 437 362, note the mid-year splits. Recently made by OEM, not been lying around. PLEASE NOTE the MID-Year splits in Fitment Chart BELOW, under 'Product Description'. Eamil us your VIN to confirm.