| Fresh air to ac blower question [message #210013] |
Wed, 05 June 2013 20:50  |
An87ttype
Messages: 157
Registered: September 2012
Karma: 0
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Im wondering if anyone has come up with a way to get fresh air to the blower intake. I notice that when stopped I sometimes get the smell of the hot motor coming through the vents. I was thinking about putting some kind of hose to draw the air from lower down somehow. Maybe from behind the bumper? The problem seems the amount of room by the opening in the blower box. The windshield wiper arm also swings in front of it. It's really not that bad, but I do find it somewhat annoying sometimes. Any thoughts?
1975 Eleganza II
Hudson Valley NY
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| Re: [GMCnet] Fresh air to ac blower question [message #210021 is a reply to message #210014] |
Wed, 05 June 2013 21:24  |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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This won't help much at stop lights, but will offer copious air under way
<http://www.gmcmhphotos.com/photos/ac-ducts/p24962-quot-eyeball-quot-style-air-vent-on-drivers-side-floor.html>
Larry Davick
On Jun 5, 2013, at 6:55 PM, Emery Stora <emerystora@me.com> wrote:
> A problem with drawing it lower down is that you'll pick up exhaust fumes from other vehicles when you are in traffic.
>
> I'd just learn to live with it the short times you are stopped.
>
> Emery Stora
>
> On Jun 5, 2013, at 7:50 PM, Daryn <An87ttype@hotmail.com> wrote:
>
>>
>>
>> Im wondering if anyone has come up with a way to get fresh air to the blower intake. I notice that when stopped I sometimes get the smell of the hot motor coming through the vents. I was thinking about putting some kind of hose to draw the air from lower down somehow. Maybe from behind the bumper? The problem seems the amount of room by the opening in the blower box. The windshield wiper arm also swings in front of it. It's really not that bad, but I do find it somewhat annoying sometimes. Any thoughts?
>> --
>> 1975 Eleganza II
>> Hudson Valley NY
>> _______________________________________________
>> GMCnet mailing list
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Fresh air to ac blower question [message #210054 is a reply to message #210013] |
Thu, 06 June 2013 07:03 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Daryn,
The problem is not so much caused by emissions from the vehicles around
you while in traffic, it is mostly all coming from your own engine
compartment. Ducting from another location is nearly impossible because of
the proximity of the access panels and the wiper mechanisms. If you have a
'75 or '76, the solution is to change it over to a complete recirc system
by opening up the original hole from the cockpit to the rear HVAC plenum,
and blocking off the underhood intake. The system will also perform much
better this way. Here is an excellent article on the different types of
systems GM used on the GMC. The best is the '77 and '78.
Steve F
On Wed, Jun 5, 2013 at 6:50 PM, Daryn <An87ttype@hotmail.com> wrote:
>
>
> Im wondering if anyone has come up with a way to get fresh air to the
> blower intake. I notice that when stopped I sometimes get the smell of the
> hot motor coming through the vents. I was thinking about putting some kind
> of hose to draw the air from lower down somehow. Maybe from behind the
> bumper? The problem seems the amount of room by the opening in the blower
> box. The windshield wiper arm also swings in front of it. It's really not
> that bad, but I do find it somewhat annoying sometimes. Any thoughts?
> --
> 1975 Eleganza II
> Hudson Valley NY
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Take care,
Steve
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| Re: Fresh air to ac blower question [message #210063 is a reply to message #210013] |
Thu, 06 June 2013 08:54 |
petemosss
Messages: 221
Registered: August 2008
Location: Jacksonville, Florida
Karma: 0
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Ok Folks, what is the best route on a 74?
Forgetting it entirely and going with an aftermarket set up? I live in the part of Florida that has no breezes.
Pete
74 Canyon Lands 26' "Emery"
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| Re: Fresh air to ac blower question [message #210067 is a reply to message #210013] |
Thu, 06 June 2013 09:30 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Check for oil leaks. One drop of oil on a manifold can produce a lot of smoke and odor. You might fabricate the rubberized "horse blinder flaps" like on the final version. I prefer the outside air source so you create positive pressure indoors and don't draw exhaust and sewer fumes in. Engine smell is better than those options especially monoxide if you run the Onan on the road. Another reason GM went to no OFF on the fan just lowest speed.
John Lebetski
Woodstock, IL
77 Eleganza II
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