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weredoingit · 10-16-2018, 06:42 AM

Our forced air heat is hardly coming out of the register in the upstairs (Bedroom) in our 5th wheel. It blows very hard down stairs, but very weak upstairs. I figure there must be a leak in the ducting? But when I run the furnace I can follow the ducting through the basement, no leaks there. But it disappears and the only way I can think to inspect the rest of it is to drop the panels on the bottom of the RV?? I'm not looking foreword to that. Is it possible that there is no leak? That it just takes the path of least resistance and comes out the lower ducts? Is there a way to access the combiner box from inside the RV? Maybe under the stairs?

FatChance · 10-16-2018, 08:07 AM

Instead of a leak in the duct, maybe the duct is blocked by something in it (mouse nest?).

egwilly · 10-16-2018, 08:16 AM

Our ducting is reachable from the pass through area inside the wall near the stairs. Our water pump is located there behind a hinged panel.
Yours might be there as well. Both the bathroom and bedroom registers terminate there. Look for an aluminum ducting channel.

I wouldn't think the coroplast should be removed, unless no other way. I've had mine off twice for valve repairs, not a big deal. Need a helper to put it back on though. Since the duct you mentioned is the bedroom, it would't be available from underneath anyway.

weredoingit · 10-16-2018, 08:49 AM

Quote:

Originally Posted by egwilly

Our ducting is reachable from the pass through area inside the wall near the stairs. Our water pump is located there behind a hinged panel.
Yours might be there as well. Both the bathroom and bedroom registers terminate there. Look for an aluminum ducting channel.

I wouldn't think the coroplast should be removed, unless no other way. I've had mine off twice for valve repairs, not a big deal. Need a helper to put it back on though. Since the duct you mentioned is the bedroom, it would't be available from underneath anyway.

Well the duct in the cargo area (under the bedroom) runs up to the bedroom register, follow it the other way towered the rear it disappears in the wall. Seems like it's heading under the steps from the kitchen to upstairs?

egwilly · 10-16-2018, 09:31 AM

Most likely that's the route it taking.

You could remove the grille and use a mirror and flashlight to peer down the tube and see if you see something disconnected. It's just plastic tubing like a clothes dryer vent line. Possible it's come apart somewhere. They usually use hose clamps to connect.

Campasaurus · 10-16-2018, 10:56 AM

If you can't see enogh, go to harbor freight and get flex cam. Once you have one you will find more and more uses for it.

weredoingit · 10-17-2018, 07:36 AM

I just took the grate off the furnace, it's right under the refrigerator. I turned on the heater. Their was so much hot air blowing out of the metal furnace enclosure. Their are 6 "Knockouts" for additional ducts? Only one out of the six has a duct connected to it, it's a 2" flex hose that appears to go down in the under belly. 3 of the other knock outs were loose with a lot of hot air blowing out right under the fridge. I got them all tight and sealed them with Flex Seal. Then the furnace pushes the heat to the door that I removed, it appears that when the air hits the door it's forced down into a duct that leads under the floor to the registers. When I reinstalled the door and turned the furnace on hot air was blowing out the door seams, so I sealed all the way around the door. Now their are no leaks around the furnace. It made the 2 registers down stairs blow even harder then before. The bedroom heat was increased slightly but not even close to the down stairs. Before I can start removing wall in the basement, I have to remove all our CRAP we have in their.