| found a surprise in the heater/ac core .... [message #318196] |
Mon, 29 May 2017 21:53  |
davidlive
Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...
Karma: -1
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So today i went to find out why the a/c or heater fan wasn't working, first found a blown fuse, with the previous owner running a wire to a switch then out to broken off bumper lights, removed all that and found i'll have to replace the dash as it's breaking. but back to the dash fan, replaced the fuse and went outside to check the fan and measure if the voltage is getting there only too smell burning and see smoke coming out of the fresh air intake, so i figured bad fan motor, and i removed it to find my SURPRISE a rat nest full of rat crap and ugh disgusting stuff.
I still need to check the replace vacuum lines and check or replace valves
Any Suggestions at getting rid of the old rotten rat crap/piss smell ?
So has anyone made a screen / filter for the fresh air ?
is there a better motor that might pull more air ?
(i have a motor from my parts coach i plan to use)
Thanks David
78 Royal #749
74 #136
Oversteer is when you hit the wall with the rear of the car, understeer is when you hit the wall with the front of the car. Hp is how fast you hit the wall, and torque is how far you take the wall with you when you hit it.
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| Re: [GMCnet] found a surprise in the heater/ac core .... [message #318207 is a reply to message #318196] |
Mon, 29 May 2017 22:55  |
Richard Denney
Messages: 920
Registered: April 2010
Karma: 9
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Senior Member |
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Yes, most folks install a 1/4" hardware-cloth screen over the intake to the
AC.
There is an electric preheater element in the bottom of the blower box,
which can causes vermin nest to smolder, as you have discovered.
The only way to remove the smell is to disassemble and clean,
unfortunately. Ask me how I know.
It's not the blower, but all the sharp turns and corrugated ducting that
slows the air down. GM just wasn't good at AC design for the coach,
particularly for the '73 and '74 models, and the only real solution is a
redesigned blower box and air path, or an underdash supplemental
evaporator/blower.
If you are replacing the dash with one of your own design, find Ken
Henderson's photo essay of the dash he made for his coach, and what he did
to improve the AC air flow.
Rick "who uses fans and wind wings, or the genset and the roof air if
necessary" Denney
On Mon, May 29, 2017 at 10:54 PM David Morrison wrote:
> So today i went to find out why the a/c or heater fan wasn't working,
> first found a blown fuse, with the previous owner running a wire to a switch
> then out to broken off bumper lights, removed all that and found i'll have
> to replace the dash as it's breaking. but back to the dash fan, replaced
> the fuse and went outside to check the fan and measure if the voltage is
> getting there only too smell burning and see smoke coming out of the fresh
> air intake, so i figured bad fan motor, and i removed it to find my
> SURPRISE a rat nest full of rat crap and ugh disgusting stuff.
>
> I still need to check the replace vacuum lines and check or replace valves
>
> Any Suggestions at getting rid of the old rotten rat crap/piss smell ?
> So has anyone made a screen / filter for the fresh air ?
> is there a better motor that might pull more air ?
> (i have a motor from my parts coach i plan to use)
>
> Thanks David
> --
> 78 Royal #749
> 74 #136
> Oversteer is when you hit the wall with the rear of the car, understeer is
> when you hit the wall with the front of the car. Hp is how fast you hit the
> wall, and torque is how far you take the wall with you when you hit it.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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| Re: found a surprise in the heater/ac core .... [message #318208 is a reply to message #318196] |
Mon, 29 May 2017 23:58 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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Amway had a product called "Pet Spray" I think that came in a small pump bottle and was not cheap...BUT IT WORKED, and left no residual stain or odor. I found it was great at removing most odors from dog crap to decomp and other things in between, like beer-scented automobile carpets. I lost the Amway guy 20 years ago, don't know if they are still around, but the product was better than FeBreeze at REMOVING odors, not just covering them up to fool your senses.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
[Updated on: Mon, 29 May 2017 23:59] Report message to a moderator |
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| Re: [GMCnet] found a surprise in the heater/ac core .... [message #318220 is a reply to message #318219] |
Tue, 30 May 2017 08:57 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Everyone with a GMC should remove the front panel from the HVAC box at
least once. Doing so will give a much-enhanced understanding of the
working (and non-working) of the system. It also affords the opportunity
to clean out collected debris, dirt, and miscellaneous contaminants (such
as squirrel & mouse nests) which steal away cooling which can't be spared.
Removing the blower dropping resistors from the lower left (driver's) side
of the box is also important because that favorite area for contamination
is only accessible through that little hole. A reduced-size vacuum hose
attachment is needed to clean the area well.
Just take a look at the following photo and some of those before and after
to get an idea of the complexity of the system:
http://www.gmcmhphotos.com/photos/dash-air-conditioning-redesign/p30764-slide141.html
Before you start, download this wonderful guide to GMC A/C; doing the
recommended repairs and modifications is very much worthwhile:
http://gmcws.org/Tech/air_conditioning/air_conditing.html
Ken H.
On Tue, May 30, 2017 at 9:36 AM, Richard Denney wrote:
> The blower resistor is what I meant--old memories needing refreshing.
>
> There is a reason it's inside the blower box (it gets hot), and it's right
> at the bottom where nests can be made. It's behind the evaporator coil, and
> so hard to get to from the blower opening, but mice can get in from inside
> the coach. But they have caused problems like this--I remember from an old
> conversation a decade or so back. Probably shouldn't have mentioned it at
> all without checking my memory.
>
> Rick "out of practice" Denney
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: found a surprise in the heater/ac core .... [message #318337 is a reply to message #318275] |
Thu, 01 June 2017 17:53 |
davidlive
Messages: 143
Registered: November 2011
Location: Simi valley, Southern Cal...
Karma: -1
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Senior Member |
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Thanks to everyone for the advice, yeah it wasn't hard to get that front cover off, and it's all mostly cleaned out, i just need to head up to the foam store to replace the foam in it, any thoughts what type to ask for ?
Thanks David
78 Royal #749
74 #136
Oversteer is when you hit the wall with the rear of the car, understeer is when you hit the wall with the front of the car. Hp is how fast you hit the wall, and torque is how far you take the wall with you when you hit it.
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