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Old 08-07-2014, 10:11 PM   #61
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I can't compete with that clever turn of phrase; won't even try. But I do have the feeling that it's easy to have more fan than needed to move the air around. I mean, when it's working, the fridge does a pretty good job with no fan, just using natural convection of the cool air descending from the fins. I'm going to investigate wiring my Fridge Fix fans in series so they run slower (and quieter). I had two fans on the backside of our Casita fridge wired up so they could be switched between series and parallel. After that experience, and needing so little air movement in the fridge, I think I might just re-wire these in series.
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Old 08-07-2014, 10:15 PM   #62
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It is very tight quarters back there. I pushed stiff wire through my thermistor hole and was able to push enough through to reach up from behind, grab and pull down. Very anal job, but if you don't want a second hole at the very least, worth the effort.
I removed the fins and fished a piece of lawn trimmer cord through the exising hole to pull the wire through and then put everything back. Actually, I pulled two wires through since neither fin set on our 6.7 cu ft fridge is grounded so I ran a ground wire also.
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Old 08-07-2014, 10:18 PM   #63
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Originally Posted by Parker View Post
I can't compete with that clever turn of phrase; won't even try. But I do have the feeling that it's easy to have more fan than needed to move the air around. I mean, when it's working, the fridge does a pretty good job with no fan, just using natural convection of the cool air descending from the fins. I'm going to investigate wiring my Fridge Fix fans in series so they run slower (and quieter). I had two fans on the backside of our Casita fridge wired up so they could be switched between series and parallel. After that experience, and needing so little air movement in the fridge, I think I might just re-wire these in series.
I like that idea; I was planning to add a speed control for my fan experiments but your wiring methods could prove more expedient.
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Old 08-08-2014, 12:00 AM   #64
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When I installed my Fridge-Fix fan, I thought I had found the answer to the cooling issue. Now that we have arrived in Texas (100 F), even the Fridge-Fix doesn't help. The temp in the bottom of the Dometic does not get down below 57 F.
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Old 08-08-2014, 01:04 AM   #65
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When I installed my Fridge-Fix fan, I thought I had found the answer to the cooling issue. Now that we have arrived in Texas (100 F), even the Fridge-Fix doesn't help. The temp in the bottom of the Dometic does not get down below 57 F.
You are right where the Groene's book (mentioned on another thread) said, in effect, you would be. At 100 degrees, an RV refrigerator is not expected to go lower than 55 degrees, they said.

In that kind of heat in the day, you can only try to have ice packs freezing overnight to put in the fridge or a cooler in the day. These RV fridges are not built the same and do not work nearly as well as home refrigerators.
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Old 08-08-2014, 06:50 AM   #66
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Originally Posted by Parker View Post
I can't compete with that clever turn of phrase; won't even try. But I do have the feeling that it's easy to have more fan than needed to move the air around. I mean, when it's working, the fridge does a pretty good job with no fan, just using natural convection of the cool air descending from the fins. I'm going to investigate wiring my Fridge Fix fans in series so they run slower (and quieter). I had two fans on the backside of our Casita fridge wired up so they could be switched between series and parallel. After that experience, and needing so little air movement in the fridge, I think I might just re-wire these in series.
Please post your progress and pictures for others, thanks.
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Old 08-08-2014, 08:59 AM   #67
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Please post your progress and pictures for others, thanks.
Will do. In the meantime, here's a view of the fin set in the 6.7 with thermistor wired disappearing behind them. The other pic is with the fins removed, exposing the hole and the high thermal conductivity grease between the fins and cooling tube. I was careful to redistribute the grease to restore good contact as I re-assembled. By the way, the screws require a Torx (star shaped) driver.
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Old 08-08-2014, 09:13 AM   #68
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So the cooling tube transmits it's cooling via the grease to the fins? Very interesting.
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Old 08-08-2014, 09:14 AM   #69
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I was wondering what that gray goo was for.
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Old 08-08-2014, 09:30 AM   #70
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That's REALLY interesting; the heat transfer through the grease (commonly called heat sink compound, used underneath cooling fins and high power transistors in amplifiers, cpu in computers) is key to heat transfer as the total heat flow is directly proportional on the surface area of the compound between mating elements. It's filled with metallic oxides, it's not really dielectric grease like used for light bulb bases. It is commercially available at electronic stores among other places: Cooler Master Thermal Compound: Appliances : Walmart.com
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