1972 Dometic Refer Works on Electric, NOT Propane?

[shirlgirl]

Hello, all,

We have a 1972 Overlander. The Dometic refrigerator works great on shore power, but we tried running it on propane to no avail. We've cleaned the burner and thermo coupler, and blew air through it, but it's just not getting cold. Anything we can try, or is cleaning the flu the next thing we should do? Any suggestions or advice would be helpful.

[drboyd]

OK, you "cleaned the burner and thermocouple[r]"

Do you see a flame when you light it?

[shirlgirl]

There is a flame, but I don't think it's burning hot enough. We ran a bottle brush through the flue (which was pretty clean and free of soot).

[TG Twinkie]

Can you post a pic of the back of the unit? Have you checked the gas pressure?

[shirlgirl]

Here are the pics requested. Thanks for the help!

[shirlgirl]

Pics sent today. Thank you!

[TG Twinkie]

I had a similar problem with my '74 Argosy refer.
There is a filter in the gas line. In my case that filter was full of liquid restricting the gas flow.
I could not find a replacement. The filter medium resembled a fiber material sort of like fiberglass.
I pulled all of the old medium out then used the filter from cigarettes.
It has worked fine for 10 years.
The filter unit is the round device that looks similar to a automotive fuel filter. It is the device second in line from where you have the yellow flex line connected. The end closest to the left side in your pic. The first device is the valve that closes when you switch from gas to electric.

[BayouBiker]

sure looks and sounds like a low gas flow/pressure issue to me also.

[GCinSC2]

Originally Posted by BayouBiker

sure looks and sounds like a low gas flow/pressure issue to me also.

Here's your slack tube and more.

https://www.youtube.com/watch?v=SD1qcH_hNYY

But one pic showed a nice flame. Any other gas appliances acting up? Maybe orifice is partially blocked?

[shirlgirl]

All other gas appliances work fine, and yes there is a nice flame burning. I've got a picture of the gas valve assembly if anyone knows where we can find another, new one? Last try before we give up on have the fridge on LP.

[BayouBiker]

It seems odd to me you'd have a nice flame and yet the boiler does not get hot enough to get the refrigerant circulating. Electric or propane just heats the boiler, ideally to the same temperature....

Now that it's out you could take a the fittings loose and inspect for trash and liquid, then blow the whole thing out. Not sure where to find a replacement other than searching online.

[GCinSC2]

And with the burner out, should have good access via mirror to look up the flue too.