Swamp snorkler what they'rewas most likely talkin bout is a pop off valve. Its a pressure release valve mounted on the compressor. It releases freon if pressures get too high and most cant be replaced without replacing the comp. As far as the original problem for both you guys it more than likely is a fan issue. Some systems have a primary fan (for the engine cooling system) and a secondary fan (for the a/c system) and just because you here a fan humming doesnt mean they're both working. High La. temps and humidity play heck with a cars a/c system. Deal with it everyday at work during the summer. A restricted condensor or a resticted orifice tube/expansion valve will cause a spike in head pressure and poor to no cooling but driving at hwy speeds rarely causes good cooling in that case.
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