does the blower continue to operate so that you have air coming out of vents because if not your coil may be icing up.this could be caused by a dirty coil or a worn blower motor not spinning fast enough[not enough air across the coil].

__________________
David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
http://www.w108.org/gallery/albums/A...1159.thumb.jpg