This OE quality air conditioning evaporator is pressure tested before leaving the factory and is guaranteed to work the first time it is installed. Designed according to OE specifications, ensuring fit and function are identical to the original evaporator, and comes pre-charged and complete with an OE expansion valve already mounted. Rein automotive products provide you with the proper fit, form and function for European vehicles. With fitments for some of the worlds finest automobiles, including Audi, BMW, Mercedes Benz, Mini, Porsche, Saab, Volkswagen, and Volvo all Rein Automotive genuine replacement parts are guaranteed original manufacturer quality. Since the air conditioning system is a "closed loop" system there is not a way to check and see if everything is working properly until the parts are replaced and the system is fully functional again that is why Rein air conditioning products are built to the exact original manufacture tolerances and when applicable pressure tested before leaving the factory. This guarantees that they work the first time they are installed.