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Old 09-21-2022, 07:04 AM   #1
Mroe
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Living area a/c unit

Our back living area a/c unit freezes up when in low ambient temperatures plus the fan motor occasionally stops for a minute. Then starts again, almost like itís shutting off on an internal overload. I was told the dealer just replaces the whole unit and apparently donít have skills to repair them. Iím thinking about replacing the fan motor and doing a charge check. What do you all think?
 
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Old 09-21-2022, 08:30 AM   #2
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Originally Posted by Mroe View Post
Our back living area a/c unit freezes up when in low ambient temperatures plus the fan motor occasionally stops for a minute. Then starts again, almost like itís shutting off on an internal overload. I was told the dealer just replaces the whole unit and apparently donít have skills to repair them. Iím thinking about replacing the fan motor and doing a charge check. What do you all think?

There is a temp probe in the evaporator fins that shuts off the compressor to prevent freeze up. I couldn't tell you where to look but its possible it vibrated out? As far as the fan stopping, I have no idea. This guy is pretty entertaining
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Old 09-21-2022, 08:57 AM   #3
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If you are running the fan on auto, try running it on high.
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Old 09-21-2022, 10:24 AM   #4
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RV ac units are sealed systems. There is no means of checking fluid levels or pressures. At the current costs for labor, you would spend more than what the ac unit is worth. I think you should have an adult beverage and rethink your plans. Or spend money on a real ac expert to advise you on what you should do.
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Old 09-22-2022, 06:30 AM   #5
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Originally Posted by Mroe View Post
Our back living area a/c unit freezes up when in low ambient temperatures plus the fan motor occasionally stops for a minute. Then starts again, almost like itís shutting off on an internal overload. I was told the dealer just replaces the whole unit and apparently donít have skills to repair them. Iím thinking about replacing the fan motor and doing a charge check. What do you all think?
We had this problem with the Dometic Capacitive Touch Thermostats. I replaced the thermostats with the MicroAir ones, and the problem is gone. Essentially, the MicroAir ignores the freeze sensor warning and continues to run the fan to prevent freeze up. Others have had luck just running the fan on low or high to accomplish this, but I never did. The MicroAir thermostats are expensive, but they are worth it if you camp where temps are in the 90's a lot.
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Old 09-22-2022, 07:18 AM   #6
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Maybe it's time for some simple maintenance, like spraying off the fins on the coils. I just did mine a couple days ago, and I was surprised how much "gunk" was clogging the fins. If it's been a while since you've done this, then that's an easy start that doesn't cost anything to potentially fix the problem. I always start simple with no cost standard maintenance procedures first, and escalate time, money, and resources one step at a time.

And just an FYI, the simple process of spraying out my coil fins on the roof improved the AC performance immediately!
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Old 09-22-2022, 08:11 AM   #7
Arkware
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We had the freezing issue too. Found the return vent filters were dirty. Also check the vent is sealed from the attic.
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Old 09-22-2022, 09:01 AM   #8
Mroe
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Originally Posted by jcurtis934 View Post
RV ac units are sealed systems. There is no means of checking fluid levels or pressures. At the current costs for labor, you would spend more than what the ac unit is worth. I think you should have an adult beverage and rethink your plans. Or spend money on a real ac expert to advise you on what you should do.
Worked on and installed Commerical refrigeration units for most of my life, so I have the ability just was curious as to what other people have done. Coils and filters are clean
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Old 09-22-2022, 05:05 PM   #9
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You're fortunate to be able to source the fittings, silver solder, draw a vacuum, and recharge an RV A/C ... I'd guess for 98% of us ... it is above our pay grade. I know where you're coming from though as I've always did my own mechanical maintenance and repair ... we'll always get the deer in the headlight looks accompanied by "you can do that?". It saddens me to be in a "just chuck it and put on a new one" world.
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Old 09-22-2022, 05:08 PM   #10
Mroe
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Yah thatís for sure, never fixÖ.. just replace
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