One thing I strongly recommend to car owners to protect the a/c system is to put 1/4" hardware cloth in front of the condenser to protect from rock damage. This is true only for cars that have an open grille. Debris can puncture the prone condenser tubes that are in front of the radiator resulting in expensive a/c repair (new condenser, dryer, vacuum, and recharge). Where I live there is a lot of road debris. Nearly every car has windshield damage. One only has to use their imagination to figure out what's going on at the level of the grille!
95 E320 Cabriolet, 131K