I would not be cutting holes in the exterior wall just to gain access to the furnace. You have no idea what’s “in the wall” and you cut the frame. I have to remove lots of furnaces from the inside, it’s less convenient but it’s the way it needs to be done. Once out you can “bench test” it.
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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