I have a 97 E420 and a/c hasn't worked since I had the car. The weather is starting to finally get warmer and I decided I need to fix this problem. I did the diagnostics and checked the trouble codes through the a/c unit. Measurement #7 which is for refrigerant level was at 0. Had not trouble codes come up. Obvious that my a/c needed recharged. Well I bought some r134a and put 1 can in. I checked the measurement afterwards and it said 1. So the second can I hooked up, I pulled up the measurement for the refrigerant level and it went up to 5 pretty fast but then slowly went down to 1 and I disconnected the can. It is obvious I have a leak somewhere, but I have no idea how to figure out where it is coming from?!?!?!?