95 325I with Hardtop Convertible

[papasmith]

I have purchased this off of Ebay and am wondering about the following.

1) What about the Hardtop Convertible? Does anyone have any opinions of this? It has a new motor for the convertible top but, every once in awhile it needs a little nudge.
2) My research seems to indicate that these are fairly reliable cars. This one has 91,000 miles and appears to be fairly well taken car of. Any opinions here what to look for and what might need fixing now or soon?
3) Air Conditioning does not work. Was told that the conpressor and fan seems to work fine. Owner says that he believes there is a leak. Any other ideas.

By the way, it is an automatic if that makes a difference.

Thanks for your help, comments and opinions.