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Old 07-25-2012, 09:37 AM   #1
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1971 31' Sovereign
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Dometic frig. model RM-75

freezer side of frig. is cooling to 32 degree but frig side is not cooling at all
does anyone have any idea what could be causing this problem.
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Old 07-25-2012, 09:50 AM   #2
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Old age? Blocked arteries?

Seriously, it could be that bits of the inner pipe that conducts the ammonia solution that cools the unit have rusted and broken off, and are floating around and lodging in parts they shouldn't.

Three things you can do:
  • "Burp" the refer by disconnecting it, securing the loose parts, and rolling it. Yes, turning it over, and allowing things to settle, one side at a time.
  • Buy a re-manufactured kit of all the innards that make it cool down, and install it. There are several manufacturers, people on here can give you their comments on that.
  • Replace the refer completely. Pricey, but the only long-term solution

Hopefully, others will post even better advice. But it's not an easy situation to get out of, IMHO.

Good luck!

ps: I moved your thread to the correct sub-forum for you
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Old 07-25-2012, 10:34 AM   #3
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It sounds like you just don't quite have enough cooling for the current situation. The freezer should be much colder than 32F, so all of the heat transfer is being used by the freezer section.

Does it behave the same way on LP and 120v? And it is it set on the coldest setting for each fuel?

If it only has this problem on LP, you may need to clean the burner and/or check your LP pressure.
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Old 07-25-2012, 01:01 PM   #4
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Try checking the vent stack for the refer for obstructions. If clear. Try putting a fan, even a portable one at the access hatch (hatch open of course) and see if the refer section will cool more. If so, you may have to install a 12 volt fan to push the hot air up the stack.
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Old 08-04-2012, 04:31 PM   #5
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RM 75 working great now!

Just to let you all airstreamers that after replacing doors to frige, and tapping the ammonia sytem, RM 75 started working like a charm freezer at
0 and frige side at 40 keeping my fingers crossed, been working on this project for 1.5 yrs. this airstream is ready to hit the road!


Thanks for all the info!
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Old 08-05-2012, 10:23 AM   #6
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Just curious, by saying you tapped the ammonia, do you mean that you "burped" it (see post 2)?
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