| Dash/AC Vac Line Routing [message #176641] |
Fri, 13 July 2012 15:52  |
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JShot
Messages: 485
Registered: October 2006
Location: NW Ohio
Karma: 0
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Senior Member |
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To all and Ken H,
Is there a diagram like this for a '78 Royale? Our coach doesn't have 3 connections on the "temperature valve" as shown in the schematic - only 2 - no 'white'
http://www.gmcmhphotos.com/photos/type-ii-dash-air-condition-modification/p19228.html
ALSO, where is the defroster 'vacuum actuator' actually physically located - the one with the yellow and blue vacuum lines attached to it in the lower right corner of the linked schematic
Thanks
John
John Shotwell
Ridgeville Corners, OH
78 Royale Center Kitchen
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| Re: Dash/AC Vac Line Routing [message #176644 is a reply to message #176641] |
Fri, 13 July 2012 16:00  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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I asked the same question about a month ago and got this answer. I think you'll also find the answer to your second question in this PDF as well.
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Bruce,
There is the supplement...
http://bdub.net/manuals/X7725/X7725.pdf
see page 1B - 25
If this is yours -- the water valve is operatied by a pink line.
Dennis
rf_burns wrote on Thu, 14 June 2012 21:20
thanks Dennis,
I have a manual, but it covers the early version control panel with 3 hoses at the temperature vac switch.
My later version has only 2 hoses.
Dennis S
73 Painted Desert 230
Germantown, TN
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Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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| Re: [GMCnet] Dash/AC Vac Line Routing [message #176666 is a reply to message #176641] |
Fri, 13 July 2012 19:15 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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John,
As far as I know, that color diagram, which I colored, is the only one
for any model. There should be a similar diagram in the '77/'78
manual though -- you can color it for posterity. :-)
Regarding the defrost valve, try going here:
http://www.gmcmhphotos.com/photos/u40-kenhenders.html
Open my album "New Dash Panel". The first photo, that shown in the
index, should show the underside of the '76 OEM dash. For me, it
doesn't work -- of the 139 photos reportedly there, only 76 actually
appear, NOT including that one.
If you can't see that photo there, I can send it to you direct. It
shows the Heat/Defrost damper diaphragm immediately to the driver's
side (right in the photo) beside the center dash duct. In other
words, it's darned near impossible to reach with the dash installed.
Hopefully it's different for '77 & '78.
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI+ & EBL
www.gmcwipersetc.com
On Fri, Jul 13, 2012 at 4:52 PM, John Shotwell wrote:
>
>
> To all and Ken H,
>
> Is there a diagram like this for a '78 Royale? Our coach doesn't have 3 connections on the "temperature valve" as shown in the schematic - only 2 - no 'white'
>
> http://www.gmcmhphotos.com/photos/type-ii-dash-air-condition-modification/p19228.html
>
> ALSO, where is the defroster 'vacuum actuator' actually physically located - the one with the yellow and blue vacuum lines attached to it in the lower right corner of the linked schematic
>
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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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