| What is this PVC thing on my AC box? [message #193381] |
Wed, 19 December 2012 20:21  |
kerry pinkerton
Messages: 2565
Registered: July 2012
Location: Harvest, Al
Karma: 15
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Senior Member |
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I have no clue what this is or why it's there.
http://www.gmcmhphotos.com/photos/data/6256/medium/D_0021.jpg
it appears to be 1 1/2 PVC, threaded into the air box. The end is capped. It rotates but won't unscrew which leads me to think there is a plastic nut on the other side of the box.
Any idea what this could be and what, if any, value there is in leaving it in place. It is right in front of the radiator cap and makes it nearly impossible to get the radiator cap off.
Kerry Pinkerton - North Alabama
Had 5 over the years. Currently have a '06 Fleetwood Discovery 39L
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| Re: [GMCnet] What is this PVC thing on my AC box? [message #193382 is a reply to message #193381] |
Wed, 19 December 2012 20:33  |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Kerry,
That appears to be what they call a mystery of life. First on I have seen!
JR Wright
78 Buskirk Stretch
Michigan
On Dec 19, 2012, at 9:21 PM, Kerry Pinkerton <Pinkertonk@MCHSI.com> wrote:
>
>
> I have no clue what this is or why it's there.
>
> http://www.gmcmhphotos.com/photos/data/6256/medium/D_0021.jpg
>
>
> it appears to be 1 1/2 PVC, threaded into the air box. The end is capped. It rotates but won't unscrew which leads me to think there is a plastic nut on the other side of the box.
>
> Any idea what this could be and what, if any, value there is in leaving it in place. It is right in front of the radiator cap and makes it nearly impossible to get the radiator cap off.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: What is this PVC thing on my AC box? [message #193384 is a reply to message #193381] |
Wed, 19 December 2012 20:41 |
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Whatever it is you have a disconnected hose right above it. I think the disconnected hose supplies warm air to your blower motor to keep it warm.
John Ruff
Chandler, AZ
1975 Eleganza
WA3RIG
If I use ZDDP in a new car - will the tappets go flat?
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| Re: What is this PVC thing on my AC box? [message #193399 is a reply to message #193381] |
Wed, 19 December 2012 22:11 |
Cadillackeeper
Messages: 464
Registered: October 2012
Location: Fort Lauderdale
Karma: 1
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Senior Member |
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That is what I was thinking.He also could have used a vacuum hose to vent cold air somewhere too.Like with an external fan sucking from the box going somewhere in
the coach .Who knows?Man, it does seem like your PO did a ton of mods back in the
day.
77 455 Elaganza II and 67 Animal, Built 500 Powered Eldo
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| Re: [GMCnet] What is this PVC thing on my AC box? [message #193414 is a reply to message #193381] |
Thu, 20 December 2012 06:46 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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It appears to be an air supply duct. Try again to remove the cap. '75 &
'76 GMCs AC units can move a lot of air if you find a way to supply it to
the blower. Looks like this could be an attempt.
On Wed, Dec 19, 2012 at 7:21 PM, Kerry Pinkerton <Pinkertonk@mchsi.com>wrote:
>
>
> I have no clue what this is or why it's there.
>
> http://www.gmcmhphotos.com/photos/data/6256/medium/D_0021.jpg
>
>
> it appears to be 1 1/2 PVC, threaded into the air box. The end is capped.
> It rotates but won't unscrew which leads me to think there is a plastic
> nut on the other side of the box.
>
> Any idea what this could be and what, if any, value there is in leaving it
> in place. It is right in front of the radiator cap and makes it nearly
> impossible to get the radiator cap off.
> --
> Kerry Pinkerton
>
> North Alabama, near Huntsville,
>
> 77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as
> an Art Deco car hauler
> _______________________________________________
> 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: What is this PVC thing on my AC box? [message #193433 is a reply to message #193381] |
Thu, 20 December 2012 11:16 |
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John Heslinga
Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada
Karma: 4
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Senior Member |
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Here is my guess:
I suspect it might have been put there to support the AC line. ( that line is the suction side of the compressor or low pressure side) there is very little to support that line and the PO may have wanted to avoid line breakage at the evaporator. That line goes directly to the engine and compressor from there and would be subject to a lot of vibration. That being said however, I cannot see in this picture, if the hose is connected or clamped to that standoff. Maybe it needs to be clamped to it to complete the "PO upgrade"
It could also have been put there to push the line away from some of the sharp metal of the radiator frame as the line passes it to the motor.
That PVC fitting is on the high pressure side (outlet) of the fan and ahead of the evaporator, so air would want to come out af the AC box and it would be ambient temperature. (Not really useful for anything as far as I can imagine. )
Best regards
John
John and Cathie Heslinga
1974 Canyonlands 260
455, Manny tranny and 1 ton, 3:70 LS,
Red Seal Journeyman, DTE, BEd. MEd.
Edmonton, Alberta
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