Mercedes: Mercedes Benz power windows and AC, window switches, mercedes benz

Question
I juts purchased my first MErcedes. A 1986 300E . it seems ot run well wiht a few bugs.
1. the passenger side power wiondpow doe snot work. How cna I go abou reparing this?
hte Ac seems not to function at its capacity.
CanI ahve htis aAC charged?  

Answer
Start with the switch, it is easy to remove and clean.
The following DIY link will work for window switches.
http://www.mercedesshop.com/Wikka/HazardSwitch

another link to help.
http://www.mercedesshop.com/shopforum/showthread.php3?p=942621#post942621

If you have a low charge on the A/C, the leak must be fixed before it can be charged.