I have a 2001 Ram 2500 4x4 5.9 and when coming to a stop, hitting a bump, or just slowing down just lightly applying the brakes the a/c will start to blow either warm or hot air sometimes I hear a clunk noise coming from the glove box area and sometimes I don't. If I turn the a/c off for a minute or two it will start to blow cold air. This keeps happening until I get on the highway. Any ideas would be greatly appreciated