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Old 01-17-2022, 08:19 PM   #1
Bemmert74
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2021 Avalanche 390DS no heat to bedroom

The floor vents to the lower bedroom is not blowing air at all. We closed off living room vents to see if we could push air and still nothing. Our question is how do we get to where the ducts are to see if it is disconnected or kinked? Where can we find a diagram of the heating system and ducts? Our daughter needs heat in her room. The upper bedroom and bathroom blow just fine as well as the living room.
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Old 01-18-2022, 03:46 AM   #2
flybouy
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There are no diagrames of anything from Keystone. Is this a new issue or is it the first time you're using the furnace? I'm guessing the furnace is under the the front bedroom steps. Typically there are return air grills in the step risers. Typical setup is a central aluminum duct running down the center of the trailer from front to back. You can remove that diffuser and take a look down to see if the duct is obstructed.
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Old 01-18-2022, 04:08 AM   #3
Bemmert74
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This is first time running furnace. Yes it is located under upstairs steps. The back bedroom steps down but no way to look under steps there. We donít see any screws or anything to remove the steps.
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Old 01-18-2022, 04:26 AM   #4
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Other than looking via the floor register you would have to go under and remove the coroplasre belly to see the ductwork. Is the trailer still in the first year warranty?
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Old 01-18-2022, 04:56 AM   #5
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Yes still in first year and yes we could take it in, but it is hard plumbed full timer unit and shop is 1.5 hrs away. They will not come to us. So we were trying to see if we could get to the area to see if disconnected. I really don’t want to pack ip my whole rv to take it in.
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Old 01-18-2022, 06:20 AM   #6
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Quote:
Originally Posted by Bemmert74 View Post
This is first time running furnace. Yes it is located under upstairs steps. The back bedroom steps down but no way to look under steps there. We donít see any screws or anything to remove the steps.
Looking at the floorplan for your trailer I do not see any steps into the rear bedroom. It appears the bedroom is on the same floor level as the living and kitchen areas. Not seeing the trailer I could be wrong.

https://www.rvusa.com/rv-guide/2021-...-390ds-tr50417

The advice in post #2 is the best way to expose your heating systems connections. The coroplast is not difficult to remove, it's just not in a convenient location (under the trailer). If you want to self diagnose and fix, I would get under the trailer with the heater running and feel for warm air escaping out of the coroplast. If you find an area in question use vise grips on the pin used to mount the coroplast. Twist out the pin and then replace with a large self tapping metal screw (being careful of electrical or plumbing lines with screw travel ). If you are unable to get under the trailer and not comfortable with the tools mentioned, and towing to the dealership is a burden, I would recommend a mobile RV tech. You could check with your dealer if they will authorize warranty service off location by someone not in their "certified" inventory. Not sure how that works but it couldn't hurt to ask.
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Old 01-18-2022, 06:21 AM   #7
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There should be other vents along that central aluminum duct that deliver air as the duct goes toward the bedroom vent. Is air blowing out of all the vents along that route??? If so, there's probably a connection close to the bedroom vent that came loose.

If there is no air along the entire route, then there's probably a connection that came loose "ON THE FURNACE DISTRIBUTION BOX" that's connected to the furnace air exchanger.

I'd first confirm air flow from the other nearby registers. If there is NO air flow, go to the furnace distribution box. That's where your problem is located. If there is air flow along the route to the bedroom vent, then remove the vent cover on the bedroom vent, use a flashlight to try to identify an opening without a couple feet of the vent cover because the disconnected hose is close to the bedroom vent.
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Old 01-18-2022, 06:29 AM   #8
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Quote:
Originally Posted by Laredo Tugger View Post
Looking at the floorplan for your trailer I do not see any steps into the rear bedroom. It appears the bedroom is on the same floor level as the living and kitchen areas. Not seeing the trailer I could be wrong. ...
If you go to the Keystone RV website and look at the 3-d depiction of the trailer floorplan, you can see that the rear bedroom is a "step down" into the room. You'll need to go to this link: https://www.keystonerv.com/product/a...oorplans/390DS then navigate into the rear bedroom, arrange the view to be "looking forward" and you can see the steps that the OP is referring to in his posts.
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Old 01-18-2022, 07:10 AM   #9
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Well there you go.
Offers more " headroom " in that bedroom. Makes sense.
Learn something new everyday.
Problem is remembering it.
Thanks John.
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Old 01-18-2022, 08:01 AM   #10
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Quote:
Originally Posted by Laredo Tugger View Post
Well there you go.
Offers more " headroom " in that bedroom. Makes sense.
Learn something new everyday.
Problem is remembering it.
Thanks John.
RMc
I think they dropped that section to fit the "loft" above it.
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Old 01-18-2022, 02:58 PM   #11
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Doesn't Keystone approve warranty work using a mobile RV repair service on a case by case basis? Worth a call to them at any rate, given the circumstances.
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Old 01-30-2022, 11:29 AM   #12
Db361
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Avalanche 390DS isssues

We have a similar issue with not only rear heating vents blocked but also the front bedroom. Only heat is in center area of RV. In addition there is no A/C air flow to back bedroom or bathroom. I found heating ventline to rear bedroom crushed. RV is currently at Dealer being repaired. A/C will probably require an air flow booster fan.
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Old 01-31-2022, 03:33 PM   #13
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Assuming you have air flow in the living room vents and none in either of the bedroom vents my bet is on a restriction at the bedroom step.
I recall a while back a post that had a similar heat problem. Don't recall if it was an Avalanche or not but the problem was the heat duct that ran the length of the trailer necked down to a very thin section to clear a cross frame or something and was restricting the air flow.
My guess this is a similar issue.
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Old 02-24-2022, 03:07 PM   #14
DC&J
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I have the same issue we just bought ours feb 6th and received today after having the dealership look into it. They said the duct was kinked and fixed. However once I got it home it was the same minimal heat and a ton of flow in the living room. I read some options below and will try to see if the ducts are opened
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