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Old 12-23-2012, 04:21 PM   #1
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Very Loud Fan for Fridge Cooling?

2012 Flying Cloud 25 (rear bedroom).

On the street side I have two grill hatches for the refer access. Behind the top hatch is a 6" 12V muffin fan mounted to the hatch opening. It is wired to a thermocouple which is hastily screwed into the finned heat sink at the top of the fridge. I say hasty because A) several fins are bent; B) there seems to be a .050" gap of sorts between the thermocouple body and the fin. (Usually thermocouples are mounted with silicone heat compound).

The problem is in two parts:
1. The fan runs about 90% of the time that the fridge is operating. Doesn't matter whether operating on 120 or gas.
2. It is LOUD. I mean really loud. In a campground you can hear it 30 feet away. Partly because it is mounted to the aluminum skin, and partly because it is a lousy brand of muffin fan with a very noisy operation.

Now then.....When I touch those heat sinks, they aren't even really warm, let alone hot. Maybe 40C? Something like that. Nothing inside that compartment feels very hot. The pipes carrying coolant get a bit hot sometimes, but oddly not where they run through the heat sink.

Questions:
1. Does anyone have this model, with the fan - and how does it work for you? Run a lot? Quiet?

2. Anyone replaced this (dealer or self) for being defective?

My suspicion is that the thermocouple is either blown, installed wrong, or is the wrong temperature. I could maybe see it coming on at 100C on the heat sink, but 40C?

Right now (at camp) I disconnected it to get some quiet.
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Old 12-23-2012, 04:55 PM   #2
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I have a 2011 23' Int'l. and the fridge fan runs FOREVER when I switch the fridge off. It's loud, in my opinion, but probably not as loud as yours, based on your description. I'm not really shedding any light on your issue, just wanted to vent about how long that sucker runs on after the fridge is turned off.

John S.
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Old 12-23-2012, 05:33 PM   #3
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Quote:
Originally Posted by JDS View Post
I have a 2011 23' Int'l. and the fridge fan runs FOREVER when I switch the fridge off. It's loud, in my opinion, but probably not as loud as yours, based on your description. I'm not really shedding any light on your issue, just wanted to vent about how long that sucker runs on after the fridge is turned off.

John S.
Good information. I suspect based on your comment, that this thermocouple is active to a very low'ish temperature. I would think 100C would be perfectly useful. It seems to be much much lower than that.

When I get home, I can remove it and find the part number. I don't want to tinker while I am 2700 miles from home base.
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Old 12-23-2012, 05:47 PM   #4
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The part you are referring to is a Thermostat, not a thermocouple. 100C might be a little high, since it is equal to 212 F.
You could install a resistor in series with the fan motor to slow it down."
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Old 12-23-2012, 05:48 PM   #5
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Loud fans have been a problem for a while. Some folks replaced the fan with a quieter one. I did and it's better, but I still get a louder harmonic inside the trailer.
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Old 12-23-2012, 06:07 PM   #6
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We've replaced a couple of the fans under warranty, and the replacements aren't much, if any, quieter. I have tried a resistor, but to slow it down enough to make it quieter means it is too slow to move enough air. One of my co-workers found a piece of dense rubber foam with sticky stuff on one side, and we removed the housing, put the foam between the housing and the door frame, then reinstalled the fan, with much better results. We are only allowed to replace on kind under warranty, but the computer fan I have for my fridge is so quiet you almost have to stick your finger into the blades to see if it is running. Replacement fans are inexpensive enough you can pull yours off and take it to a computer shop to get a better, quieter one, and not be out much more than the price of amfast food lunch.
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Old 12-23-2012, 06:07 PM   #7
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Thermostat...I see. When I hear that word, I think of something adjustable. Is this device adjustable?

I'd like to exactly what is being cooled by this fan. It blows outward through the hatch, which seems to be a very inefficient means of cooling anything (lots of resistance).

There's the space itself of course. There are some pipes for the coolant and there is that finned sink.

I'm guessing this fan is trying to vent the space in general down to X deg, and apparently X is rather a low number? (When I pulled in, the air temp was 62F and nothing in that space felt like more than say +20F above ambient. Pretty sensitive, isn't it?

One would think that the fan ought to be at the bottom and be sucking in fresh air to go out the top, if the object is to cool the space?

Just thinking out loud.
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Old 12-23-2012, 06:17 PM   #8
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Quote:
Originally Posted by Wayne&Sam View Post
Loud fans have been a problem for a while. Some folks replaced the fan with a quieter one. I did and it's better, but I still get a louder harmonic inside the trailer.
Oh boy. I see a treasure trove of information about this fan issue. Ha ha - I might have known! Great stuff and it looks like there are plenty of fixes available.
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Old 12-23-2012, 10:37 PM   #9
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This is an old problem. See threads below for replacement fan(s):

http://www.airforums.com/forums/f425...ml#post1191250

http://www.airforums.com/forums/f425...ml#post1191357

Also, a search of this site will provide additional links to other threads on this subject, where others have used alternate products and methods to address this problem.
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Old 12-23-2012, 11:17 PM   #10
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No fan switch?
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Old 12-23-2012, 11:52 PM   #11
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Our 2005, 19-foot Bambi has a factory-installed fan switch just inside the door, low and to the left, just above the fire extinguisher. That switch turns the power OFF and ON to the fan, but the thermostat on the exterior coils (top vented door) actually controls when the fan runs (when the power switch is ON).

Not sure where the switch is on the 20-foot Flying Cloud.
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Old 12-24-2012, 05:15 AM   #12
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Quote:
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No fan switch?
Well, you certainly made me look - but no, I don't have a fan switch on mine.
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Old 12-24-2012, 07:37 AM   #13
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The new models have no switch, but one is easily added. Least complicated spot is next to the fan.
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Old 12-24-2012, 10:03 PM   #14
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I don't think the switch is connected to the year, but rather the model...as far as I know, only 19'ers have an on/off switch for the fan inside for some reason. It may have to do with the type of fridge...ours does not vent through the ceiling like a 25' frig does (and those models with larger refrigerators). A friend's 22' with an even smaller frig under the counter does not have a switch and friends with a 23' with a larger frig don't either.

The purpose of the fan is to act as an exhaust fan to pull air through the fins and out...but the original fan and location is very inefficient. We replaced ours with Snyder fan kit...a funnel affair with the fan at the base (yellow rectangle in pic #1) the brings the air in from the bottom and pushes it upward through the fins...the thermostat was originally connected to the fins (green circle in pics #2) but the tech installing it moved it to the pipe (blue circle in pic #2) for a better location for temps. We have since had to replace the fan again. It is still louder than I'd like it to be but it's much better. We typically turn it off at night, as in our area it runs quite a bit of the time.

If you want to add a switch to yours, you can easily do this inside the compartment.
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