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Old 03-30-2019, 10:03 AM   #1
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Air Conditioner not cooling

I know, beat to death but.... My camper is 3 years old. I had the AC replaced at around 1 to 1 1/2 years under warranty, it is a Dometic. The symptoms are the same as the first time, it is not cooling enough. I live in Florida and we camp about every other month, the weather conditions are the same as last year and the year before that and so on. Normally when I turn it on it takes about 3 to 4 hours to cool down to 76 then it will cycle on and off from there. The last time I used it, I turned it on when we set up as usual, it was around 78 to 82 outside and around 95 or so inside, and overnight it dropped to the mid to upper 60ís outside. At 300 in the morning it was still hot inside to the point I was sweating, normally by 800 in the morning the windows are fogged over, so something is different than normal. The first time it was replaced the dealer said it was low on Freon, being a retired auto mechanic and seeing this type of problem in cars and trucks I agreed. They said it couldn't be charged and had to be replaced, is this true? Or could there be a possible cause I'm overlooking. The place I went to have it repaired last time sold out, I trusted them, but I donít anything about the new owners. The large dealership in Tampa Florida I bought it from wrecked it when they had it and then had the nerve to charge me for the damage, I refused to pay it and after explaining it for about 4 hours at a volume everyone could hear, they agreed I shouldnít have to pay. I donít trust them to so Iím kinda on my own. The bottom line question is, should I buy a replacement unit?
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Old 03-30-2019, 10:12 AM   #2
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Wow. And summer is on the way!
Start with simple things. Clean filter? Even a little restriction in air flow can hinder cooling. Is it icing over? You can look up at coils with the cover off and see ice if it is. You know that's not good.
Is cool air leaking back into return air?
These are things I've dealt with thru 4 RVs.
Someone with way better info will chime in soon.
BTW, you can have connections added to you high and low pressure lines so it can be purged and recharged. Matter of feasibility. Best of luck.
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Old 03-30-2019, 10:21 AM   #3
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If its ducted, you can block off the ducts after the last ceiling vent. A lot more air flow and cooler. Did this to mine and it helped. Also awnings on side windows. Put on mine, both sides. Also helps.
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Old 03-30-2019, 10:25 AM   #4
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There right about not being able to charge it, unless they added ports, how did they determine it was low on Freon? Only 2 ways to tell first is with gauges which they can't do. 2 nd could be what is called a delta T that is taking a read of the inside temp and the condition air temp, you should be somewhere 17 to 20 degrees different between the two, also they can measure the amps it is pulling. Other then that you have a thermister in the coil, make sure that is in the correct place. If your unit is truly low on Freon then your evap coil should be starting to freeze, that is where that thermister comes into play shutting down the compressor. I think it's to early in the year for Florida's high humidity. I would question how you could go through 2 units in a year and a half. Yes Dometic is garbage in my opinion, but not that bad.
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Old 03-30-2019, 10:27 AM   #5
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Quote:
Originally Posted by jimmymjr View Post
I know, beat to death but.... My camper is 3 years old. I had the AC replaced at around 1 to 1 1/2 years under warranty, it is a Dometic. The symptoms are the same as the first time, it is not cooling enough. I live in Florida and we camp about every other month, the weather conditions are the same as last year and the year before that and so on. Normally when I turn it on it takes about 3 to 4 hours to cool down to 76 then it will cycle on and off from there. The last time I used it, I turned it on when we set up as usual, it was around 78 to 82 outside and around 95 or so inside, and overnight it dropped to the mid to upper 60ís outside. At 300 in the morning it was still hot inside to the point I was sweating, normally by 800 in the morning the windows are fogged over, so something is different than normal. The first time it was replaced the dealer said it was low on Freon, being a retired auto mechanic and seeing this type of problem in cars and trucks I agreed. They said it couldn't be charged and had to be replaced, is this true? Or could there be a possible cause I'm overlooking. The place I went to have it repaired last time sold out, I trusted them, but I donít anything about the new owners. The large dealership in Tampa Florida I bought it from wrecked it when they had it and then had the nerve to charge me for the damage, I refused to pay it and after explaining it for about 4 hours at a volume everyone could hear, they agreed I shouldnít have to pay. I donít trust them to so Iím kinda on my own. The bottom line question is, should I buy a replacement unit?
Short answer, yes.
It is not normal for an a/c unit to fail so quickly. Newer units are more prone to refrigerant leaks because the tubing is thinner. Makes them cheaper to build and a marginal increase in heat transfer permits the claim of increased efficiency. I would make a very thorough inspection of the entire power supply. That was most common in my a/c repair career.
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Old 03-30-2019, 11:19 AM   #6
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Everything is good as far as clean coils and all. I haven't checked the duct work though.
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Old 03-30-2019, 11:28 AM   #7
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I've looked and its not freezing. 2 units in 3 years is to many. When they replaced it its been ice cold until this month.
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Old 03-30-2019, 11:32 AM   #8
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I'll give the power a look. I tried it at my house and at the KOA I stayed at last weekend and it did not work either place. I think the shore power is fine maybe a connection on the unit is the issue. Whatever the case I can't justify a new unit every couple of years.
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Old 03-30-2019, 01:43 PM   #9
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air conditioner not cooling

Not to hijack the discussion, but I have a question for Witch Doctor. Last year we were camping with two units going when the outside high temps reached 115 for a few days. Is it likely that the two units cooling the camper to say 95 would be normal? I just know it would be midnight before my sweating slowed enough that I could try to sleep. Doesn't it sound like I probably have problems as well?
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Old 03-30-2019, 02:40 PM   #10
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Dometic AC

My TH is 3 years old and on its 3rd Dometic AC. Both failures were due to loss of refrigerant and covered under warranty by Dometic. After the first failure I bought an extended warranty on the AC and am glad I did.

One way you can get an indicator of the problem is to measure the amps drawn while running. When mine was inoperative you could hear the compressor kick in but was only drawing about 7 amps.

My units were replaced by a local Dometic approved mobile RV service who came to my home for the repairs both times.
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