Roger, Just a heads up. My dash AC also seemed to be on the fritz last summer, while the other two evaporators worked fine off of the same compressor. Found my temperature knob (heater control knob) was turned up, causing warm air up front. Most likely bumped it with my leg at some time getting in or out of my seat. I'd look at that...My dash cooling also only works when bedroom and galley units are turned on, which is good because they will ice up if the fans are not running on high speed. So, when I run dash air, all units come on at full speed except the dash and I can get by at 50% speed on it without icing up..

FWIW: