| Got heater diverter valve, now where is the vac line! [message #173346] |
Thu, 14 June 2012 20:12  |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Hi all,
Picked up one of those heater hose diverter valves from NAPA up here in the Great White North. $37.00, a tad more than the 11.99 in the US of A. But by the time I get it across the border shipping & customs fees would make it more $$$.
Anyway, I have a 77 PB so I'm looking for the correct vacuum line to use. From Gene's site I have a "type III" system with 2 lines going to the temperature vac switch.
It appears the "Gray" line from the temperature vac switch has been T'd back into the main Vac line.
Is there a vacuum line diagram for this style? All I can find is this:
http://www.gmcws.org/Tech/air_conditioning/air_conditing.html
But it doesn't show any vac line routing.
Thanks
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: Got heater diverter valve, now where is the vac line! [message #173347 is a reply to message #173346] |
Thu, 14 June 2012 20:22  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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Bruce,
Which vacuum line you use would be dependent on what you are trying to accomplish. If you just want to bypass the heater core when the AC is running then use the vacuum line that goes to the existing heater control valve. It is in front of the heater box. That vacuum line is controlled by the dash heater control.
Next time you want something like that, email me and I'll go get it and mail it to you as an antique auto part. It would have been 11.99 plus 7% sales tax and US postage. The total would have been around $20.00 USD.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: Got heater diverter valve, now where is the vac line! [message #173349 is a reply to message #173346] |
Thu, 14 June 2012 20:37 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Ken,
Thanks for that offer, I may take you up on it sometime!.
For the vacuum line, my coach didn't have a vacuum shutoff valve when I got it, so that's what I am trying to add.
Both of the lines from the temperature control vac switch are T'd into lines going to the A/C heater function switch, so I'm looking for the correct routing of the lines.
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: Got heater diverter valve, now where is the vac line! [message #173351 is a reply to message #173346] |
Thu, 14 June 2012 21:10 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Bruce,
In the Maintenance Manual, section 1, page 104, Fugure 110 is a vacuum line diagram.
It shows a gray line to the water valve -- (my 73 has a gray line to the water valve.
If you don't have a MM -- you can see them on bdub.net
Does this help?
Dennis
| rf_burns wrote on Thu, 14 June 2012 20:12 |
Hi all,
Picked up one of those heater hose diverter valves from NAPA up here in the Great White North. $37.00, a tad more than the 11.99 in the US of A. But by the time I get it across the border shipping & customs fees would make it more $$$.
Anyway, I have a 77 PB so I'm looking for the correct vacuum line to use. From Gene's site I have a "type III" system with 2 lines going to the temperature vac switch.
It appears the "Gray" line from the temperature vac switch has been T'd back into the main Vac line.
Is there a vacuum line diagram for this style? All I can find is this:
http://www.gmcws.org/Tech/air_conditioning/air_conditing.html
But it doesn't show any vac line routing.
Thanks
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: Got heater diverter valve, now where is the vac line! [message #173362 is a reply to message #173346] |
Fri, 15 June 2012 05:19 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Senior Member |
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Dennis,
Thanks for that.. I have that supplement from the GMC CD! Forgot all about it.
Now to figure out why a PO has T'd it into another vacuum line.
For those interested in the diverter valve, it works simply by using a single butterfly to divert the coolant on either side of butterfly. A simple elegant solution. It will leak a bit of coolant leak by though, so it won't help in the case of a heater core leak.
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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