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12-07-2021, 01:40 PM
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#1
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Junior Member
Join Date: Dec 2021
Posts: 6
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Refrigerator WARMER with internal fans?
This has got me scratching my head... I installed a couple of fans in my Dometic refrigerator to improve circulation. Without the fans, the AC gets down to 34 no problem. With the fans running, it's anywhere from 45-55.
The fans are these: https://www.coolerguys.com/products/...025l12b-fsr-em
They are mounted right underneath the fins, blowing into them.
So far, other than turning them off to confirm the issue, I have tried relocating them to the front of the fins but that made no difference. I might try reversing the direction, but every install guide I see recommends what I have.
I've searched all over and can't find anyone who has reported a similar issue. I can move them to some other part of the fridge if I need to, but would love a good explanation of what is happening.
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12-07-2021, 01:51 PM
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#2
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Senior Member
Fleetwood Owners Club Workhorse Chassis Owner
Join Date: Jun 2016
Location: On the continental divide
Posts: 2,621
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Have you tried the fridge with just one fan ?
You know that you can "fool" the fridge by sliding the probe (Over on the right)
Up is colder, down is warmer. A half inch at a time is what we try, based on the outside temperature.
Mike in Colorado
__________________
2004 Fleetwood Pace Arrow 37c, 8.1 gasser, (Jezebel) Ultra RV ECM / TCM, plugs wires, and rear track bar, PPE deep Tx pan w/ temp gage, Bilstein's, Sailun's & Sumo's all round, pushed by a 2002 Grand Caravan, on a Master Tow Dolly OR a WR-250 on a rail.
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12-07-2021, 01:52 PM
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#3
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Senior Member
Join Date: Jul 2005
Posts: 5,996
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Grab hold of a 7 watt C4 bulb that's energized. This might give you a clue.
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TandW
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12-07-2021, 01:56 PM
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#4
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Senior Member
Join Date: Feb 2015
Location: Indiana
Posts: 176
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1 fan up and 1 down to improve circulation ??
I havnt put one inside my fridge yet.
But I did put a fan in the vent area at the back of the fridge.
That helped our fridge run cooler.. 34-36 degrees in most weather.
If the sun is baking on that side and its 95 out its tougher for it to keep at those temps if opening/closing a lot. and we will throw a few frozen water bottles inside the fridge then..
Bob
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2008 Damon Thor Outlaw
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12-07-2021, 02:03 PM
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#5
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Senior Member
Join Date: Oct 2014
Posts: 7,868
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Where are you measuring temperature?
With the fan(s) your temperature should be much more even throughout the refrigerator.
But, depending on where your thermometer is located, it may read colder or warmer.
__________________
Brett Wolfe
Ex: 2003 Alpine 38FDDS. Ex: 1997 Safari Sahara. Ex: 1993 Foretravel U240
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12-07-2021, 04:18 PM
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#6
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Junior Member
Join Date: Dec 2021
Posts: 6
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Quote:
Originally Posted by wolfe10
Where are you measuring temperature?
With the fan(s) your temperature should be much more even throughout the refrigerator.
But, depending on where your thermometer is located, it may read colder or warmer.
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I have a thermometer on the second shelf, in the same place with and without the fans running. You can barely see it behind the can in the picture, but it's normally hanging from the top shelf or sitting more center.
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12-07-2021, 04:20 PM
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#7
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Junior Member
Join Date: Dec 2021
Posts: 6
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Quote:
Originally Posted by TandW
Grab hold of a 7 watt C4 bulb that's energized. This might give you a clue.
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I considered just having power running might affect things, but these fans use .09A, hardly anything, and definitely not more than other internal fans which seem to work. There is no other source of heat.
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12-07-2021, 04:29 PM
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#8
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Junior Member
Join Date: Dec 2021
Posts: 6
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Quote:
Originally Posted by Flyer15015
Have you tried the fridge with just one fan ?
You know that you can "fool" the fridge by sliding the probe (Over on the right)
Up is colder, down is warmer. A half inch at a time is what we try, based on the outside temperature.
Mike in Colorado
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Yes, forgot to mention that I have also tried to adjust the thermistor, but it's been at the same position with and without the fans running.
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12-07-2021, 04:41 PM
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#9
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Senior Member
Join Date: Nov 2018
Location: Fulda, MN
Posts: 1,240
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I wonder if by blowing them right on the fins if they are removing too much of the cooling and not letting them get cold enough? JMHO
__________________
2000 Winnebago Adventurer 32v, P32 Workhorse Chassis with 01/2000 build date with factory wide track front end, 7.4l Vortech, J71 Ultra RV upgraded 67,000 miles.
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12-07-2021, 07:49 PM
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#10
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Senior Member
Join Date: Nov 2015
Posts: 26,689
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TOO Much AIRFLOW.
Use just one fan vs the two
Thermometer in Glass of Water is better way of measuring Temps vs Open Air temp readings
Moving thermistor>>>>>>>>>>>>
If your fridge uses Auto Temp Control (no temp settings) then moving it UP/Cooler and Moving it DOWN/Warmer
*Affects temp by 4*F - 6*F overall
If fridge has Temp Settings then thermistor should be in OEM Position
Thermostat is calibrated for temp range 34*F--42*F based on thermistor location
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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12-07-2021, 08:29 PM
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#11
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Junior Member
Join Date: Dec 2021
Posts: 6
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I moved the two fans to a lower shelf and after a few hours it looked like temp was heading back down. Going to try to put a single fan back against the fins and let it run tonight, will let everyone know how it goes.
Thanks for the suggestions.
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12-08-2021, 12:30 AM
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#12
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Senior Member
Join Date: Jun 2016
Location: SW Louisiana
Posts: 8,848
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I use a single slightly lower power draw "silent" fan in my refrigerator, located near where yours are in the photo and it seems to work well, mine is rated at around 16 cfm and .06 A https://www.amazon.com/ARCTIC-P8-Sil.../dp/B07XR1F94T
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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12-08-2021, 07:00 AM
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#13
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Junior Member
Join Date: Dec 2021
Posts: 6
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With the single fan next to the fins it got down to 40 overnight. Better, but still higher than it should be.
Will try a few more variations and see if a different position makes more of a difference.
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12-08-2021, 01:11 PM
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#14
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Senior Member
Join Date: Jan 2009
Posts: 5,345
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Quote:
Originally Posted by UsefulDrivel
Without the fans, the AC gets down to 34 no problem. With the fans running, it's anywhere from 45-55.
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Quote:
Originally Posted by UsefulDrivel
With the single fan next to the fins it got down to 40 overnight. Better, but still higher than it should be.
Will try a few more variations and see if a different position makes more of a difference.
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I'm most likely missing something but thought I'd ask.
One thing that could be making it difficult for me is not knowing if "AC" is a typo or if it refers to an actual thing. But here's my question anyway, your first post states 34° with no fans. That's definitely cold enough so I'm wondering why the idea about adding fans against the evaporator coil? I know there can be small variances throughout the frig but I'd sure think 34° would cover them.
__________________
03 Itasca Sunova, Workhorse P32 with the 8.1 and 4L85-E
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