Home » Public Forums » GMCnet » [GMCnet] WE ALL NEED MORE AIR
Re: [GMCnet] WE ALL NEED MORE AIR [message #322159 is a reply to message #322131] |
Tue, 15 August 2017 16:28 |
KB
Messages: 1262 Registered: September 2009
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lqqkatjon wrote on Tue, 15 August 2017 07:06You said you mounted it differerntly then Tom? Can you post a picture?
I have a 75, and I just cant put my thoughts around the max air vent. Mine has a large floor ioening that I would consiter the recirc opening.
Sometime before next spring I am really going to have to test and learn what the vacuum flapper vents are supposed to do, and start there. I still plan on adding a aux evaporator, but having the oem working better would allow more ease and obviously help heat/defrost side.
I also wonder if maybe there are mouse nests one cannot see. I know in a 91 f-150 they can clog up vents that you never knew existed. I have had the front of my hvac box opened in the past year and cleaned things up and replaced the gasket on the heat/ac flapper.
I believe the "max air" slot change was done sometime in 75, maybe pretty late. There was also a kit available, which I think basically
did the max air modification to existing boxes. If you have no air coming out of that bottom slot with the controls set all the way to the left
on "recirc", either the vac control to the max air door is broken, or you have the earlier style box, which uses the big slot below the dash as a recirc intake.
If you have the max air version, there will be a flapper door just inside the slot on the left 12" or so, and the old vacuum pot for the recirc door on the blower side of the box is used to operate the max air door.
Without the max air slot, either moving the old blower to the front of the box as Mark Wall did, or installing the new blower as Tom did, would improve your airflow somewhat. Unfortunately, the real problem is the ducting.
Anyway, here are pics of my installation directly on the back of the ac box, right in front of the slot below the dash.
In that position, the recirc slot would basically become a fresh air intake for the blower when the outside "recirc" door is open:
http://www.gmcmhphotos.com/photos/hvac-original-and-mods/p63546-new-blower-arrangement.html
http://www.gmcmhphotos.com/photos/hvac-original-and-mods/p63548-new-blower-arrangement.html
http://www.gmcmhphotos.com/photos/hvac-original-and-mods/p63547-new-blower-arrangement.html
Look at the the diagrams in my album as well as the pictures of various boxes and you should get a much better understanding.
One caveat: in Brand's "Separating Hot from Cold", he basically drew the 77/78 duct plenum on all the boxes. For the earlier boxes,
the vacuum controlled doors are spread around the dash, inside and out, and there's no plenum on the cockpit side of the box.
hth,
Karen
1975 26'
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[GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Wed, 02 August 2017 15:38
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Wed, 02 August 2017 19:05
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Wed, 02 August 2017 19:09
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Wed, 02 August 2017 21:00
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jimk on Wed, 02 August 2017 21:42
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Wed, 02 August 2017 22:15
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jimk on Wed, 02 August 2017 22:26
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Wed, 02 August 2017 22:58
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Wed, 02 August 2017 23:11
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Wed, 02 August 2017 23:27
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Re: [GMCnet] WE ALL NEED MORE AIR
By: Keith V on Thu, 03 August 2017 08:54
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jimk on Thu, 03 August 2017 09:33
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Wed, 02 August 2017 22:25
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Thu, 03 August 2017 11:47
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Thu, 03 August 2017 12:11
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Thu, 03 August 2017 13:19
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Thu, 03 August 2017 13:47
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jimk on Thu, 03 August 2017 14:47
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jricke on Thu, 03 August 2017 16:45
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Thu, 03 August 2017 16:55
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Re: [GMCnet] WE ALL NEED MORE AIR
By: bhayes on Mon, 17 July 2017 14:45
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: jimk on Mon, 17 July 2017 20:53
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: Rob on Thu, 03 August 2017 13:36
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Thu, 03 August 2017 17:35
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Thu, 03 August 2017 23:08
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Re: [GMCnet] WE ALL NEED MORE AIR
By: tphipps on Fri, 04 August 2017 06:55
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Fri, 04 August 2017 16:53
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Sat, 05 August 2017 21:36
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Wed, 09 August 2017 21:25
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Mon, 14 August 2017 21:33
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Tue, 15 August 2017 16:28
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Thu, 03 August 2017 19:21
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Thu, 03 August 2017 20:12
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: johnd01 on Thu, 03 August 2017 20:29
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Re: [GMCnet] WE ALL NEED MORE AIR
By: USAussie on Thu, 03 August 2017 20:41
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Re: [GMCnet] WE ALL NEED MORE AIR
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Re: [GMCnet] WE ALL NEED MORE AIR
By: KB on Thu, 03 August 2017 23:05
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Re: [GMCnet] WE ALL NEED MORE AIR
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