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My dash air was working sporadically last year when we bought our 2004 Revolution (by Fleetwood model 40D on Freightliner chassis, side-breathing radiator with Cummin ISC diesel power plant... cause I know someone will ask ;-) It would blow cold for a few minutes after starting and then peter out. But now it is warm from the start. I know that I might have multiple problems. A tech told me the initial problem sounds like heater air is mixing with the cooled air, so it only blew cold until the engine heated up. But I suspect that the lack of any cooling now is likely due to lack of refrigerant. I am considering purchasing a vacuum pump and manifold set so that I can properly recharge the system myself (the equipment is about the price of an hour at Cummins-Atlantic!). My main concern is that the low-point cap is at the front of the coach and the high-point is at the rear, so obviously the manifold hoses cannot be plugged into both at once. How should I go about drawing-down and refilling the system? Or should I hang it up and pay Cummins?