I have a '99 Volvo S70. My air conditioning works great…on the open road. In town or in traffic, it starts blowing uncooled, damp air. I, therefore, think it must be a problem with something other than the A/C itself. My husband drove too far forward at a high curb with looking at a beautiful view (OOPS), and a piece of my car fell out. It was a large plastic piece that belonged behind the bumper. Our mechanics (not a Volvo dealer) reattached it. Could this have been poorly reattached thereby causing air not to flow correctly into my A/C?
I doubt if that is the problem, but it is possible the A/C fan is not turning on. Open the hood and look inside with the engine running and the A/C off. You normally will see one or no fans running. Now have someone turn on the A/C ... Does another fan turn on? If not it could be the fan or a relay.