I rented an electric vacuum pump to dry the lines after I have a friend evacuate the system of old refrigerant...which side do I put the vacuum pump on? I assume it is the "suction side" but dont want to make any mistakes. Thanks

__________________
http://www.betten.mercedescenter.com...n_banner_1.jpg
1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat