Does the heat work? My cold worked at times almost never any heat. It was
the dual valve in my case.
You might also want to check the temperature wheels themselves, there is
trouble shooter somewhere on the site.
Hopefully its not the condenser.

Good Luck

john
i also have a 320 and have the same problem as you. i had the system re-
gassed but there is a temperature sensor somewhere inside the car that is not
working correctly. There is no a switch to put turn on but if the red light
on the E/C but is lit the climate control will not work. if you find where
the temperature sensons is will you e-mail me, thanks mickdobson@hotmail.com