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Old 10-24-2012, 10:29 PM   #1
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1973 25' Tradewind
lafayette , Tennessee
Join Date: Nov 2011
Posts: 1
p 22 suburban pilot parts

On a recent trip in our 73 tradewind, the furnace appeared to "overfuel"(long yellow carbon flame) quite a bit. I have both owners and service books and consulted them. I adjusted pilot and it made no difference . air intake was clear and fan speed was what i felt was sufficient. Also, the furnace would cycle with thermostat in the off position. What is the prob ? from what i've read parts are nil for these . if someone has ideas let us know, this is our first camper so only a vintage AS would do !
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Old 10-25-2012, 12:06 AM   #2
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1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
After almost 40 years, it is probably best just to replace it with a new, safe furnace.

If you want to do a total disassembly, look for mud dauber or wasp nests in the intake system, pipes, fan itself, or other areas. Check the rubber crossover tube, it was a failure point on those furnaces and is not available, recall was over years ago. The replacement tubes had a red stripe on them.

If all looks clean then check for rust in the main cast iron burner. Lots of disassembly needed to get there. Rust can block the slots and make for lazy and off colored flame.

But, basically, replace the furnace. Your life is not worth the risk, and many have leaking combustion chambers as well as a host of other issues.
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