Looking at the floorplan for the 316RLS, it seems the furnace is on the road side, just aft of the water heater. You'd access it by either the exterior furnace door (if it has one) or by removing the aft wall inside the passthrough, crawling into that space, under the toilet/shower and past the water heater....
Hopefully, if you walk around the outside of your RV, you'll locate the water heater and just aft of it, you'll find a vertical access door. That is your furnace. If all you see aft of the water heater is a small plate with one or two exhaust ports, then you'll have to access the furnace from the passthrough.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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