| [GMCnet] Furnace duct in 23' '73 [message #327423] |
Fri, 22 December 2017 13:36  |
Olly Schmidt
Messages: 1265
Registered: February 2014
Location: Germany and Scottsville, ...
Karma: 8
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Senior Member |
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Step by step I am working through my issues, and wonder if anyone knows,
if the furnace air duct of the warm air going from the kitchen behind
the bathroom to the rear of the coach has any other junction, or if it
goes straight through?
Before investing in a boroscope/endoscope type camera, I thought it is
less expensive to just ask :-)
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II 26', VA
'73 Sequoia 23', Germany, SH
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Best regards
Olly Schmidt
PGP Key ID: 0x18a9 3a1f 4196 bf22
'76a Eleganza II, VA
'73 Sequoia, SH, Germany
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| Re: [GMCnet] Furnace duct in 23' '73 [message #327425 is a reply to message #327423] |
Fri, 22 December 2017 14:51  |
cbryan
Messages: 451
Registered: May 2012
Location: Ennis, Texas
Karma: 3
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Senior Member |
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Hey, Peer,
I don't own such a unit but I have read here on the forum that on some coaches, there is an inline duct booster fan for the duct behind the stove that often is inoperative, disconnected, too loud, or ineffective. (Might be only for 26 footers). One theory is that the lion's share of the air is cycled from outlets close in proximity to the cold air intake to the heater, thus, it is often the case that very little heat comes out of that rear outlet, same for the bath. A better booster fan might help, the ideal situation (so I think) is a cold air intake located back there (good luck finding room for that!) It might be more effective to convert the present duct into an intake, so that heated air from the front has to go back there to be recycled. It would involve restricting the present intake near the heater and there might be engineering considerations with respect to air flow sufficient to keep the heater from cycling on the overheat switch. Adding a duct outlet often helps with that cycling as well. I hope this helps some. The take away is that few of those outlets at the back of the RV are really effective. Same goes for long travel trailers, I have spent a lot of effort, (insulated metal ducts that are smooth inside, extra outlets), to discover that the bathroom had negligible heat, same for the rear bedroom. I've no direct experience with the GMC, as our heater has had all the ducts removed, and the P.O. says that the heater is so hot it will "run you out of there". We've never had to use it yet. Good luck with your heat situation.
Carey
Carey from Ennis, Texas
78 Royale, 500 Cadillac, Rance Baxter EFI.
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| Re: [GMCnet] Furnace duct in 23' '73 [message #327429 is a reply to message #327423] |
Fri, 22 December 2017 16:36 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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Peer Oliver Schmidt wrote on Fri, 22 December 2017 14:36Step by step I am working through my issues, and wonder if anyone knows,
if the furnace air duct of the warm air going from the kitchen behind the bathroom to the rear of the coach has any other junction, or if it goes straight through?
Before investing in a boroscope/endoscope type camera, I thought it is less expensive to just ask 
--
Best regards
Peer Oliver Schmidt
PGP Key ID: 0x83E1C2EA
'76a Eleganza II 26', VA
'73 Sequoia 23', Germany, SH
Peer,
In our coach, that duct goes behind the galley (kitchen) and into the head (bathroom) and there it has a steel part that has a small outlet. It continues on over the water tank where there is another outlet into the space where the potable pump lives and then goes on around the back with two outlets into the rear room.
I don't have any pictures at all.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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