Ponch, I would assume that a "whiiiiiifffffff" of ammonia would indicate the cooling unit has a leak, and probably needs to be replaced. Hope that is not it, but, Dometic techs have a lot of experience replacing their cooling units (unfortunately for we RV'ers).
Good luck!
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Robert
Robert and Carlene
2005 RE3, S/N 2107 (sold Jan. 2010)
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