Home » Public Forums » GMCnet » Heater/AC Vacuum Hose Question(s)
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| Re: [GMCnet] Heater/AC Vacuum Hose Question(s) [message #216158 is a reply to message #216152] |
Mon, 29 July 2013 19:01   |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Mark,
That is what he heater control valve does. It controls the temp for the heater. You don't have to rig anything up!
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Jul 29, 2013, at 7:20 PM, A. <markbb1@netzero.com> wrote:
>>
> Thanks JR.
> Bob Burkitt suggested that I put an actuator back in and leave the manual valve for seasonal shutoff. I don't think I will have any trouble finding one, although I would rather rig up something that varies the amount of coolant through the heater core with the temperature lever on the dash control (like cars had back in the day).
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
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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: [GMCnet] Heater/AC Vacuum Hose Question(s) [message #216179 is a reply to message #216160] |
Mon, 29 July 2013 20:25 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Mark,
The answer is still yes! Go to the maintenance manual X-7425 for the 1973 coach and page 1-84 Fig 64. The temperature control controls the water valve. Pick any one of the valves that I had listed and you should be good to go! Just to make it clear, this is the valve that you are missing on the 3/4" rubber line that goes to the heater. You said that you had a manual valve in that line, you can leave that manual valve and add the missing valve just after it. Pages 1-43 & 1-44 give an explanation on how the controls work. The 1973 MM is somewhat lacking on pictures of the right side of the heater/ac system under the drives side door.
This manual can be download:
http://www.bdub.net/manuals/X7425/X7425.pdf
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Jul 29, 2013, at 8:13 PM, A. <markbb1@netzero.com> wrote:
>
>
> powerjon wrote on Mon, 29 July 2013 19:01
>> Mark,
>> That is what he heater control valve does. It controls the temp for the heater. You don't have to rig anything up!
>>
>> JR Wright
>> 78 Buskirk Stretch
>> 75 Avion
>> Michigan
> It appears to me that the water valve is either open or closed. So the heater core gets full flow of hot engine coolant, or none.
>
> Are you saying there is a valve in the coolant line (inside the blower box) that controls the amount of coolant flowing through the heater core, and that valve is operated by the temperature lever of the dash control panel? If so, then that part will do what I want.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
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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: [GMCnet] Heater/AC Vacuum Hose Question(s) [message #216195 is a reply to message #216179] |
Mon, 29 July 2013 21:45 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| powerjon wrote on Mon, 29 July 2013 20:25 |
Mark,
The answer is still yes! Go to the maintenance manual X-7425 for the 1973 coach and page 1-84 Fig 64. The temperature control controls the water valve. Pick any one of the valves that I had listed and you should be good to go! Just to make it clear, this is the valve that you are missing on the 3/4" rubber line that goes to the heater. You said that you had a manual valve in that line, you can leave that manual valve and add the missing valve just after it. Pages 1-43 & 1-44 give an explanation on how the controls work. The 1973 MM is somewhat lacking on pictures of the right side of the heater/ac system under the drives side door.
This manual can be download:
http://www.bdub.net/manuals/X7425/X7425.pdf
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
|
JR,
Thanks for all the encouragement. I have the manual, and have been staring at figures and explanations the better part of the day. I don't believe the vacuum actuated water valve is variable, it is either full on, or full off. That is not to say that there is not a valve on the other end of the cable operated by the temperature slider.
I have TWO temperature controls out of parts vehicles that I have been studying pretty thoroughly, and, although there is a temperature slider on the control I don't know what it connects to on the other end of the cable. I have a spare blower box that I will dig out and see if there is a water valve in it at the other end of the temperature cable, near the heater core.
None of the figures I have seen depict a variable coolant valve in the heater core area. Once I find that variable valve, I will be satisfied.
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| Re: [GMCnet] Heater/AC Vacuum Hose Question(s) [message #216198 is a reply to message #216195] |
Mon, 29 July 2013 21:56 |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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Is thought most cars were hot water was on or off, with a flap to control
the ratio of hot to cold air?
On Jul 29, 2013 7:46 PM, "A." <markbb1@netzero.com> wrote:
>
>
> powerjon wrote on Mon, 29 July 2013 20:25
> > Mark,
> > The answer is still yes! Go to the maintenance manual X-7425 for the
> 1973 coach and page 1-84 Fig 64. The temperature control controls the
> water valve. Pick any one of the valves that I had listed and you should
> be good to go! Just to make it clear, this is the valve that you are
> missing on the 3/4" rubber line that goes to the heater. You said that you
> had a manual valve in that line, you can leave that manual valve and add
> the missing valve just after it. Pages 1-43 & 1-44 give an explanation on
> how the controls work. The 1973 MM is somewhat lacking on pictures of the
> right side of the heater/ac system under the drives side door.
> >
> > This manual can be download:
> > http://www.bdub.net/manuals/X7425/X7425.pdf
> >
> > JR Wright
> > 78 Buskirk Stretch
> > 75 Avion
> > Michigan
> JR,
>
> Thanks for all the encouragement. I have the manual, and have been
> staring at figures and explanations the better part of the day. I don't
> believe the vacuum actuated water valve is variable, it is either full on,
> or full off. That is not to say that there is not a valve on the other end
> of the cable operated by the temperature slider.
>
> I have TWO temperature controls out of parts vehicles that I have been
> studying pretty thoroughly, and, although there is a temperature slider on
> the control I don't know what it connects to on the other end of the cable.
> I have a spare blower box that I will dig out and see if there is a water
> valve in it at the other end of the temperature cable, near the heater core.
>
> None of the figures I have seen depict a variable coolant valve in the
> heater core area. Once I find that variable valve, I will be satisfied.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
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1973 26' GM outfitted
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| Re: [GMCnet] Heater/AC Vacuum Hose Question(s) [message #216231 is a reply to message #216210] |
Tue, 30 July 2013 08:34 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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Senior Member |
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Mark,
You are correct on the function of the valve, my apologies. I was thinking of the later model cars. Unless you're going to replace the entire air handling system the stock system gives you temp controlled all be it manually. That said you still need the valve to restore the function to the factory HVAC system. It is a cheap repair until you can find something that will work for you.
I was incorrect on the line size as it is actually a 5/8" hose. The valve shown is actually a 3/4" PEX valve.
Here is picture of the installation on another coach.
<http://www.gmcmhphotos.com/photos/general-pictures/p50106-coolant-shutoff-valve.html>
A few days ago I posted on a complete dash air replacement project done by another GMCer. At the bottom is the parts list for the project and the suppliers name and phone. Don't know if Acme is still in business. You could also check with Vintage Air and see if they have a temp to vac controller or a temp to electric valve controller.
file:///Volumes/Dash%20AC%20Conversion/acdash.htm
http://www.vintageair.com/index.asp
JR Wright
78 Buskirk Stretch
75 Avion
Michigan
On Jul 29, 2013, at 11:57 PM, A. <markbb1@netzero.com> wrote:
>
>
> Ronald Pottol wrote on Mon, 29 July 2013 21:56
>> I thought most cars were hot water was on or off, with a flap to control the ratio of hot to cold air?
> Don't know about most cars, but I just confirmed that the heater door in the blower box is how the GMC motorhome does it.
>
> I won't make any immediate changes, but I am thinking about how to get rid of the heater door and putting in a variable valve operated by the temperature slider/cable to control the coolant through the heater core. Mixing air seems silly, it just makes more sense to control the temperature of the heater core.
>
> And I also was looking at the way that Zay Brand said to increase the recirc air in the 73 and 74 models. When you do that, you block off incoming air to the heater and defroster. In other words, the recirc door is closed so the fresh air is restriced to an inlet of only a few square inches. You would need to undo the mod to get decent heat and/or defrosting if/when you need it.
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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