Dodge Dakota

I have a 2004 Dakota that has been in shop 16 times for A/C problems over last 2 1/2 years, Dealer cant' find a solution. The air output from center vent is never lower than 48-50 degrees in " recirculation" mode and if switched to " normal" mode you can smell the humidity in air and the temperature rises, as high as 70 degrees if stopped such as at a Traffic Light then drop to around 60 when moving.
Dealer has recharged system and replaced the Drier, liquid line, and condenser, didn't work.
Any suggestions that I can pass along to the dealer's mechanic?
August 31, 2007.

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