Expansion Tanks - The expansion tank is used to collect the expanding coolant from the coolant circuit. Behr Hella Service - Engine Cooling and Air Conditioning for Passenger Cars and Heavy Duty Trucks. With more than 1000 quality parts,Behr Hella Service offers a wide range for European cars and Heavy Duty Trucks. Our customers benefit from the combined expertise of BEHR and HELLA. Over 100 years of technical knowledge, quality focus and unparalleled service. This means, an ideal combination of products and service for your business. HELLA’s Sales organization plus BEHR’s extensive OE product knowledge form Behr Hella Service.