I've had nothing but AC issues with mine. Currently have a hole in the condenser, so yeah. But the ATC also needs to be replaced. Once those ATCs go bad, the temperature knob becomes a roll of the dice trial and error hope for the best kind of thing. Replacing that may very well do the trick.
Wayne Rodd.
5757 Angola
Toledo, OH
419-304-9996
(SW side of town near US 23 and Airport Rd)
They're not cheap, but most any Mercedes dealer can fix anything.
State Street Auto Service
2115 S. State St, #B
Ann Arbor, MI 48104
734-761-8006
(They're a Napa AutoCare Center, but specialize in Sprinters)
Copeland's Garage
464 Western Rd
Warren, ME 04864
(207) 273-4097
Remke's Garage
8122 S Grant Hwy
Marengo, IL
815-923-4182
(They're about 20 miles east of Belvidere)
Black Rock Truck Group
114 School Ground Rd
Branford, CT 06405
(203) 481-0269 ext. 123
Grand Prix Motors Inc.
90 Federal Rd
Danbury, CT 06810
203-743-3737
Precision Performance
681 Danbury Rd
Wilton, CT 06897
203-544-8558