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We have a Dometic RM2652. When we first bought the trailer, the reefer would cool down, then when it cycled, it would not cool further and within a couple of hours would start warming up. Dometic replaced the cooling unit and all has been fine since then.
Initially, when it would start to cool down, the ventilation fan near the cooling unit behind the reefer would start. It was somewhat noisey, but not really that bad, however, when it cycled and started warming up, the fan ran constantly and it was very noticable. So loud in fact that it became annoying, especially at night when things were quiet. The reason, I think was that it was on all the time trying to help cool the unit. Once the new cooling unit was installed, I very seldom hear the fan, and when I do, it's only on for a couple of minutes then off for a long while before it cycles on again.
It's not annoying because it isn't a constant whine.
Your referigerator is substantially larger than ours, with, I believe, 2 cooling units, so it makes sense that it would work harder to cool the interior and need more ventilation to keep the backside cool. I'd think your fans would run longer, but I'd also think they wouldn't be any noisier than before. You will hear then inside when things are quiet.
I'd venture to say that if the first set sounded like this and the second set is just the same, that's pretty much the best it's going to get. You may be able to find a trailer similar to yours, turn on the reefer and compare the sounds to what you have in your existing trailer. That would tell you whether you have a problem or not.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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