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Old 08-25-2012, 02:32 PM   #1
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Roof Air wont blow cold

I have a 1992 Damon Challenger. It has one roof air conditioner (Mach 1 6757). I just bought motorhome last month and I am trying to prepare to go on vacation next week. The air was not blowing hard or cold but was running (compressor and fan.) So, I cleaned the evaporator and the condenser but in the process I got the fan motor wet. (i know I know). So today, I installed a new AO Smith fan motor and put it all back together. Everything including the compressor came on and ran good but no COLD air. Before I scrap the unit for a new one..is there something I haven't done I could try? I put a new run capacitor in it, fan motor, cleaned condenser and evaporator. Do you think the condenser could have leaked out freon? Some of the fins are a little bent.

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Old 08-25-2012, 06:06 PM   #2
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Does anyone know if the compressor has a capacitor or switch that could be bad? Thanks

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Old 08-25-2012, 06:25 PM   #3
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If the compressor is running, its capacitor and relays are fine. I suspect it simply isn't chilling anymore. The external heat exchanger should be quite hot to the touch while the internal one (accessed from inside through the ceiling) should be cold. If they aren't, it's dead.

If its out of freon, it has a leak. These are sealed units so a filler port would have to be added in addition to finding and fixing the leak. Most people find it wiser to just replace it. After all, its 20 years old.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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Old 08-25-2012, 06:51 PM   #4
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You are pretty sure the compressor is running? If you can check to see what kind of amperage it's pulling when the compressor is running you can often get an idea of your state of charge?
1997 37' HR Endeavor, 275hp Cat, Freightliner
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Old 08-29-2012, 08:42 PM   #5
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It was out of freon. $60 for 3 lbs and its blowing ice cold. Repairman said could last 1-2 years. Obviously there is a leak or there wouldn't have been valves installed previously. Given the age of coach and my use for it, I am satisfied with this! Hope this helps someone.
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