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Old 07-18-2011, 02:42 AM   #1
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Hi Maxum folks

Hope everyone is having a great summer so far. The admiral and I are doing great.

My question is......... ever since we have had our 2001 3000 SCR when the temps get into the high 90's my AC will freeze up. This is when it has to run along time and doesn't get to cyle off. The condenser gets a nice sheet of ice on it and then I shut it off and let it melt. After that it works fine.

If the unit doesn't cyle back and forth once it gets to it the temp setting I have this problem. Temp was high 90's today and had the ac set at 80.

I am going to give the condenser blades a good cleaning tomorrow and see if that helps. Nothing is blocked as far as air flow goes. Our unit is underneath the forward bed and I wonder if I remove a plywood divider that would help with the condenser circulation?

Two years ago I have had it checked out by an so called ac expert at our marina and said that I was not low in freon but had a bubble of some sort in the system. ??????

Any thoughts from any of you HVac experts out there in maxum land?

Roger
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Old 07-18-2011, 03:09 AM   #2
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well...that is just wrong...especially since I don't have a boat...however....your AC freeze up is usually due to low freon...or not enough air flow over the fins of the exchanger...try turning your fan up on high..see if that doesn't change the freezing problem..



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Old 07-18-2011, 03:22 AM   #3
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Thanks SP.......... we all hope that you and your admiral get your summer turned around for the better. This problem of mine is a pin prick compared to what you have gone through!

I am going to bring down a portable air compressor and blow the fins out to see if that helps.

Roger
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Old 07-18-2011, 03:27 AM   #4
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Seapuppy has it on the nose, low freon and /or dirty coils. Clean her up first and see how she does. Good luck!
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Old 07-18-2011, 04:30 AM   #5
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Thanks guys..........I'm cleaning the coils tomorrow, then calling my hvac friend.
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Old 07-18-2011, 02:53 PM   #6
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One other piece we experience here is hotter than hell land. Make sure the boat is sealed tight. If I leave a door or port open and run air conditioning the condensation will freeze it in a heartbeat.
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Old 07-18-2011, 05:39 PM   #7
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Thanks TS.......

That got me thinking (which is dangerous) I don't have a door vent on the head door so we keep a small fan going on the ledge in the head and then we open up the bathroom window and I blow all my stinky air next door toward my neighbor slip. (nice guy huh?).....It keeps the bathroom much cooler from if I did nothing. I wonder if that has anything?
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Old 07-18-2011, 05:48 PM   #8
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I do that as well but keep the door shut. My buddy a couple slips away has to "step down" his air. (So if it's 90 in the cabin he goes to 85, then to 80, then to 75) and once he's there it's ok. Anything else and it freezes over. He definately needs a charge.

For me it's only when we have good humidity and the rear window, port hole, or door is left open she freezes over. I then turn on the heat for 10 minutes and defrost, close everything up and go from there. I have no other problems......sounds like that charge check is necessary for you.
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Old 07-21-2011, 04:37 PM   #9
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Well an update...............bought a can of Evap foam ( condensor fin cleaner) and a fin cleaner brush. Did the business on the fins. Clean as a whislte. While in the cabin...temp read 100 degrees. Turned on the A/C got it down to 96 within an 30 minutes. Getting late in the evening so took off. I am having the freon checked next week.

Thanks for all the help!

Roger
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Old 07-21-2011, 04:57 PM   #10
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you still need freon. My cabin shows 100+ degrees and in 30 minutes will be in the low 80's to 70's.
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