The climate on my A3 didn’t work since the purchase. It was re-filled because of this, but it didn’t work again after a few days. Errors were found quickly. At the connection point between the capacitor and the refrigerant hose it ran out of poison green. Then I got the suitable seal at Audi and used it. But it’s still leaking. Are there typical sources of error or tricks? I also wonder why not use two bolts on the opposite side to connect them.