Filter Dryers -The filter elements of the air-conditioning system are either referred to as filter dryers or accumulators, depending on the type of system. The task of the filter-dryer is to remove impurities from the refrigerant and also to dehumidify it. 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.