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Old 11-08-2015, 07:21 PM   #1
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No heat from rear furnace vent

Last camping trip I fired up the furnace in my 3170ds. I found that no air (hot or cold) was coming out of the rear vent that exits under the bed in the back. While winterizing today I removed the black plastic cover in the water pump compartment to fix something and found this.

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Apparently FR didn't think that the 4 inch bolts hanging down would puncture the foil duct pressed up against them when the cover is installed. I repaired the duct (in 3 different places) but still have no air exiting the vent. I think the duct is pinched closed where it attaches to the furnace. Everything is so crammed together in there I think this particular run of duct is collapsed.
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Old 11-08-2015, 09:28 PM   #2
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Originally Posted by rsscully View Post
Last camping trip I fired up the furnace in my 3170ds. I found that no air (hot or cold) was coming out of the rear vent that exits under the bed in the back. While winterizing today I removed the black plastic cover in the water pump compartment to fix something and found this.

Attachment 93918Attachment 93919Attachment 93920

Apparently FR didn't think that the 4 inch bolts hanging down would puncture the foil duct pressed up against them when the cover is installed. I repaired the duct (in 3 different places) but still have no air exiting the vent. I think the duct is pinched closed where it attaches to the furnace. Everything is so crammed together in there I think this particular run of duct is collapsed.

Oh no! Can you pull it off at the furnace end to see how that looks? It's hard to think of what could be snakes through there to check openness without tearing it more. Maybe a hamster??
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Old 11-08-2015, 09:52 PM   #3
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I pulled the grill below the refrigerator off to look at the ducts coming out. The one in question is in the back, of course. I can barely get my hand in there and there is no room to move anything around anyway.
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Old 11-09-2015, 10:32 PM   #4
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I pulled the grill below the refrigerator off to look at the ducts coming out. The one in question is in the back, of course. I can barely get my hand in there and there is no room to move anything around anyway.

Of course, it's the one you can't reach. Of course.
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Old 11-10-2015, 11:01 AM   #5
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Murphy's law
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Old 11-10-2015, 11:40 AM   #6
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The flex-duct to my rear heat vent was totally crushed by one of the Romex runs that was pulled tight across it. I cut one of the zip ties holding the Romex and pulled some slac and now have heat.
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Old 11-10-2015, 11:58 AM   #7
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If I pull the cover off again I will look for that. Thanks.
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Old 11-10-2015, 06:24 PM   #8
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The flex-duct to my rear heat vent was totally crushed by one of the Romex runs that was pulled tight across it. I cut one of the zip ties holding the Romex and pulled some slac and now have heat.
Go "Air Cav"!!!
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Old 11-10-2015, 06:36 PM   #9
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Yep same thing happened to me also. Where FR had pulled the duct work through the cabinet it ripped. (very small hole for a duct to go thru) Since it was behind a false walls I did not realize I had a problem. I thought I just had low air flow. I was poking around one day and found it the rip. Replaced the whole run with new duct work and cut the hole bigger to accommodate. Works great now.
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Old 11-10-2015, 09:05 PM   #10
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rscully thank you for the info, I also have the 3170ds and I thought that it was just me. I could not get the heat to come out of the rear vent under the bed. I have only done minor investigations so far and have come to the conclusion of everyone on this posting. Everything is jammed into every space thanks for the info. Happy Traveling and be Safe
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