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Comment by Kevin F Smith on July 5, 2020 at 7:18am

So the front air conditioner unit on our 1995 Itasca Suncruiser is acting up.


It is a Coleman Mach series, and is the original one on the coach.  It is a ducted unit.


So here are the symptoms:  When it reaches the set temperature on the wall thermostat, the fan shuts down, but the compressor keeps humming and doesn't shut off like it always has before.  And now the cooling fins freeze up into a block of ice (the fins you can see from the inside if you take the ceiling vent cover off).  When the fins freeze up, air flow obviously stops, and it stops blowing cold air, even though the compressor and the fans are still working.


So now I have to run the rear AC until the front AC thaws out completely...and then I can turn on the front AC and it will work for a whole day...and then be frozen again by morning.


It is stupid hot and humid right now in south central Georgia.


I have the means to buy a new one, but don't want to shell out almost a grand if I don't have to.


So any thoughts?  Are the symptoms familiar to anyone here?  What would cause the compressor to keep running even when the fan shuts off?  If I shut off the wall thermostat, the compressor STILL keeps running, until I hit the hard switch that turns the AC on from the front to the back.


Is there a relay up in the top unit that might be sticking open?  Would a bad capacitor do this?  Am I looking at an easy fix, or a replacement?


Thanks!


Kev

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