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Old 12-07-2021, 02:40 PM   #1
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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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Old 12-07-2021, 02:51 PM   #2
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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
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Old 12-07-2021, 02:52 PM   #3
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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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Old 12-07-2021, 02:56 PM   #4
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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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Old 12-07-2021, 03:03 PM   #5
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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.
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Old 12-07-2021, 05:18 PM   #6
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Originally Posted by wolfe10 View Post
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.
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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Old 12-07-2021, 05:20 PM   #7
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Grab hold of a 7 watt C4 bulb that's energized. This might give you a clue.
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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Old 12-07-2021, 05:29 PM   #8
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Quote:
Originally Posted by Flyer15015 View Post
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
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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Old 12-07-2021, 05:41 PM   #9
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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
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Old 12-07-2021, 08:49 PM   #10
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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
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Old 12-07-2021, 09:29 PM   #11
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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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Old 12-08-2021, 01:30 AM   #12
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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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Old 12-08-2021, 08:00 AM   #13
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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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Old 12-08-2021, 02:11 PM   #14
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Quote:
Originally Posted by UsefulDrivel View Post
Without the fans, the AC gets down to 34 no problem. With the fans running, it's anywhere from 45-55.

Quote:
Originally Posted by UsefulDrivel View Post
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.
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.
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