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Old 07-07-2013, 03:57 PM   #1
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Class A Diesel pusher Dash AC -working or not

I have a 92 30' Pace Arrow Gas and a 2004 42' Coachmen Sprotscoach Legend Diesel. (intend to give the Pace to my kids but they have to come and get it) The Legend dash AC seems to be tepid at best. When I stick an AC Thermometer in one of the vents it gets to 60 degrees at best. this is on 70-80 degree days. When I do the same with the Pace - it goes to 40 degress. I put a pressure gauge on it and it is is the correct range. The compressor is working. I pull the dash unit and checked the evaporator for blockage - there was none - I washed it and blew it out anyway. The fan works great. I took the Legend to a dealer for another issue (double door refrigerator died) and he siaid he will check it out but it may be working properly and 60 may be all I will get. I bought mine used but if I was paying over 200K like a lot of you have - I wouldn't expect my dash AC top be putting out 60 degress. Is that the rest of your experience? Is there something I am missing?

2004 Coachman Legend 420TS-Cummins 400HP Turbocharged Allison 6spd - Spartan Chassis
1992 Pace Arrow 30E Chevy 454 TBI 4L80E
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Old 07-07-2013, 05:26 PM   #2
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Check that the heater valve is closing completely. Many have installed a ball valve in the heater hose to make sure it's off in summer. In addition, make sure on 'max cool' setting the flapper is completely closed to outside air. Adding hot outside air can also raise your A/C vent temperature.


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Old 07-07-2013, 05:36 PM   #3
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60 sounds a bit high on a 70 degree day. I would expect about a 20 degree difference. I would guess the 92 Pace is not using the same refrigerant as the Legend so comparisons are difficult. The dash air in my 97 Endeavor has a 20 degree differential (80 outside and 60 from the vents). The Heater Valve is a good guess as possibly passing some hot water.
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Old 07-07-2013, 05:36 PM   #4
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I had the problem with the heater valve working itself open after a while so I installed 2 ball valves on the inlet and outlet of the heater matrix - with recirc OFF I now get 35F below ambient - today, with an outside temp of 75F I am seeing vent temps of 38F. However in Vegas at 115F I could only get it down to 60F. It didn't help much by switching it to recirc unless I also ran the coach ac.
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Old 07-07-2013, 05:50 PM   #5
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The ball valve will work but here is something to read if you decide to replace the Evans control unit.
Seems like many valve controls have not been installed correctly into the AC/Heater unit.
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