Note：*Please make sure the installation site is clean. Or, it will cause operating obstruction, even make the temperature of the compressor very high, and the belt on the clutch may melt. *Because the item is with oil when sent to you, so there is no need to add oil when you use it the first time. But you need to add the refrigerant , please add about 500g, don't need to fill up. There may be noise if the refrigerant is added too much. *No installation instruction included, professional installation is highly recommended.Specification & Feature: *Condition: 100% Brand New and High Quality.*According to the original factory specifications.*Perfect match for the original car.*Stable characteristics, high reliability.Please Note:*Be sure to clean the air conditioning system before installation, otherwise it will cause compression broken.*No installation instruction included, professional installation is highly recommended.Package Includes:1 x Air Conditioner Compressor W/ Clutch