Originally Posted by Inland RV Center, In
1. The reefer must be within a one half bubble of being level, and that becomes more critical the hotter the ambient temperature.
2. The burner orifice must be cleaned every couple of years.
You must also hear a slight "roaring sound" when the burner is on high. If not, then it's not hot enough to promote the cooling.
Thank you for this, I've been troubleshooting a poor cooling/no cooling problem with my 1961
Dometic M70 for the past few days and thanks to you I managed to fix it this evening.
I don't ever recall hearing the burner 'roar' during my past year of ownership and the fact that the flame looked nicely blue and conical told me that the problem must be elsewhere. I carefully stripped the burner this evening and from looking at light through the jet I could barely see a hole through it, soaking in alcohol and a few blasts with compressed air fixed it - it now makes a very reassuring (quiet) roar.
For the benefit of anyone else finding this, I should add that with the blocked jet the flame did respond to the control knob slightly
but what I was seeing was mostly the supply from the gas bypass. For some reason the blocked jet didn't affect that anything like as much as it did the 'main' flame.
Apart from the no cooling/barely cooling, another symptom was that the secondary flue running from the top of the refrigerator through the body of the Airstream and out via the roof vent was never warm to the touch. The duct shroud which loosely couples the Dometic flue to the Airstream flue was fairly hot however.
Thanks again Andy.