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Old 05-03-2016, 06:06 PM   #1
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fridge cooling problem Dometic DM2852

Having a cooling problem with my fifth wheel fridge. 2011 Crossroads Cruiser Sahara. Since day one cooling has only been adequate. I had it check right after we bought it and was told working fine no problem. Our last outing cooling was great, outside temps were only in the 80s. On the way home stopping half way for a quick lunch the fridge temp was 52 deg. I took it back in to the same dealer and they say I need a new fridge. #@%!ers. Cooling unit out. I have been monitoring it over the last few days and my results are below

RV fridge Dometic DM2852
2 way fridge 120v electric & gas

I made sure drip tube has sufficient droop to hold water like p-trap.

4/30/16
Electric
65 Outside temp 8:00AM fridge 43 deg. fins 37
74 Outside temp 2:00PM fridge 50 deg fins 43
80 Outside temp 7:00PM fridge 49 deg 42

Switched to gas
5/1/16
Gas
56 Outside temp 6:30AM fridge 37 deg fins 30
65 Outside temp 5:00PM fridge 50 deg fins 44

5/2/16
Bypass control board
After 3 hrs
60 Outside temp 8:00PM fridge 37 deg fins 26
5/3/16
50 Outside temp 7:00AM fridge 17 deg fins 9
75 Outside temp 2:00PM fridge 33 deg fins 24

One hour after switching back to controlled electric
75 Outside temp 6:00PM fridge 43 deg fins 38

Electric heat element check
Outlet was pushing 124V. Amp rate on the heating element was 2.68A
2.68A X 124V = 332W
+/- 10% (33) = 365W element seems to check out!

Gas is just as bad, so Im kind of think control board since when bypassed temps dropped to freezing.
Am I missing anything? Any help would greatly be appreciated!
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Old 05-03-2016, 06:17 PM   #2
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Open the refig, If I remember right as you look intoo the unit you will see some finns. On this finn a a small slide you move this up or down to adjust the coolong. I think down is more cooling
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Old 05-03-2016, 06:31 PM   #3
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I had trouble 2 - 3 years back. It was the thermistor. they are not very costly. $20.00 to 25.00
Plugs in at back of fridge and clips onto the fins.
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Old 05-03-2016, 07:08 PM   #4
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Yea, up for more cooling but that didn't help. I thought if the termistor was bad it would cause the fridge not to cycle and freeze up? It's a cheap enough part to try! But will wait and see if any other ideas come along.
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Old 05-03-2016, 07:10 PM   #5
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I know others have added a second cooling fan behind the fins.
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Old 05-03-2016, 07:47 PM   #6
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Quote:
Originally Posted by mark5w View Post
I know others have added a second cooling fan behind the fins.
Inside the fridge or back of unit cooling the condenser? I tried one in the fridge. All it seemed to do after 6 hours was move the warn air around!
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Old 05-03-2016, 07:51 PM   #7
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There is a check for the thermistor. It used to be on this forum but not sure if it still is. Has to do with putting the bulb end of the thermistor into a glass of ice water and measuring the resistance at the two wire ends. You may be able to find the test "online". I agree though, from your data it sounds like either the control board or thermistor is bad.
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Old 05-03-2016, 07:55 PM   #8
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There is a check for the thermistor. It used to be on this forum but not sure if it still is. Has to do with putting the bulb end of the thermistor into a glass of ice water and measuring the resistance at the two wire ends. You may be able to find the test "online". I agree though, from your data it sounds like either the control board or thermistor is bad.
I found some where else 2000 at room temp, and 9000 when placed in ice water.
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Old 05-03-2016, 08:27 PM   #9
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The fan was placed behind the fridge. Here is a picture. For more info, pm NorskeNY
He has description, parts list, and pics of his mod.
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Old 05-04-2016, 06:38 AM   #10
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mark5w, mine is setup exactly the same only two cooling fans side by side. Just a little further down maybe 10" or so! This morning outside temp when leaving for work. 52 deg Fridge temp 33 temp on the fins 24. Cold front pushing out today should get up to mid 80's. With sun beading down on that side of the RV should be equivalent to 90 or so deg.
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