I have purchased a used 2001 dodge ram 1500 2 wd... tried the air conditioning and not only does it not blow cold, but it also smells very musty / moldy, kind of like a wet basement in an old house. Need to get the air conditioning fixed and will try to recharge first... however, I need to get rid of that smell before I move forward... is there a good product or method I should use to get rid of the smell?

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AC Stinks, smelly air conditioning (http://www.ricksfreeautorepairadvice.com/RepairTopics/Heater%20AC%20Blower/ACStinks.html)

Ask your dodge dealer where the cabin air filter is located and change it, also spray air intake for a/c with javex or similar bleach to kill mold and mildew. Also do not smoke in your vehicle as this will also make a/c smell. Hope this helps you