Hello, I have two problem with this 99 S500. The car is great but recently ran into some issues.

1. Whenever I turned on the a/c, no air would blow through the center vent. The two sides, top or bottom would work only. I'm not sure if I have a vaccum leak or there could something with my control unit......

2. My assist door or trunk would work one day then not the next. I'm not sure if my car is possesed or just got a mind of its own.

Any information or suggestion is greatly appreciated.