I have slowly been loosing the coolant in my A/C and went to get it recharged. However, the shop was unable to add refrigerant to the A/C because of corrosion on the fitting. They tried cleaning it, but were unable to get a good seal. Cost me $75.00 in Chicago and they couldn't do anything and I got to spend the 85 degree days in a hot truck and the nights at the motel. Next time you are under the hood of your truck, make sure that the plastic caps for the charging and evacuation of the A/C are not broken or missing.
Drive Safe
Drive Safe