Lube the tracks with white Lithium grease (CRC makes a spray version, available at most auto parts stores). Manually run the sunroof closed with the hex wrench in the tool kit. Wait for warmer weather, then tackle a proper fix.
Quotes to live by:
guessing gets expensive
nothing is more expensive than a cheap BMW
Ken Kanne, Silverhill, AL, E36 Forum Mod/Craigslist addict/Hoarder of all sorts of stuff
1995 318is "Bebe"; 1993 325is "Elvira" 1985 635CSi "Katja" 1984 633CSi "Sylvia"
HAVE I HAD MY MEDS YET?