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Can somebody tell me where exactly to connect the vaccumm line in the car to properly operate it? I guess I will have to use an Y shape fitting to get 2 outlets.
My idea of course is that the valve opens when the heater mode is running
BTW, my car is a 74 with A/C
Last edited by corvetero; Jun 2, 2016 at 02:14 AM.
I did the same thing but didn't bypass, it just shuts off the water pipe coming from the inlet manifold. Does your car have ac?
I used this diagram and connected the vac hose to the new valve from one of the connections that kept vac at the valve in all cases except when the console dial was at the heat position. Sorry I cant remember which one it was now.
I mounted the valve below where the hoses enter the heater core.
Willcox publish some good diagrams of the heater vac hose circuits, I don't know if I can publish these but I'm sure a web search will throw them up for you.
I did the same thing but didn't bypass, it just shuts off the water pipe coming from the inlet manifold. Does your car have ac?
I used this diagram and connected the vac hose to the new valve from one of the connections that kept vac at the valve in all cases except when the console dial was at the heat position. Sorry I cant remember which one it was now.
I mounted the valve below where the hoses enter the heater core.
Willcox publish some good diagrams of the heater vac hose circuits, I don't know if I can publish these but I'm sure a web search will throw them up for you.
Can you please post the link for valve you go? I'm getting crazy with this issue because steel brass valves use indicate ID instead of OD and it's a mess.
Well, I was double checking the vacuum outlets on my car and the System is not the same.
I don't have any white stripped vacuum hose coming out from my system, but it's true that the outlet for the white one exist, but there is a piece of silicone, like a welded tap, which doesn't allow to connect anything unless you drill a hole.
So, apparently can be connected on that one if needed in order to operate the cutt-off valve.
Here you can see the free outlet #2, and how is clogged/welded with a piece of silicone.
You will probably have to drill (or what ever) so you can put that white striped hose to the water control valve.
I looked at the chart closely and see that the white stripe goes direct from water control valve to the selector. On an 82 there is a little gizmo on top of the heater box that operates as the on/off for the blended heat/air.
You will probably have to drill (or what ever) so you can put that white striped hose to the water control valve.
I looked at the chart closely and see that the white stripe goes direct from water control valve to the selector. On an 82 there is a little gizmo on top of the heater box that operates as the on/off for the blended heat/air.
Do you have the water control valve installed?
No, I don't have any, wondering why not any.
As far as I know, port #2 ,white one, would cut off the flow only when AC max position position selected.
I built a manual bypass valve. Plan to paint it and mount down low out of sight. On in winter off in summer. My need for heat is relatively limited as there is enough residual engine heat for all but the coldest days. I also intend to remove handles when installed.
74's didn't have a water shutoff valve from the factory strangely enough so I'm not sure our climate control vacuum valve has the same ports or is routed the same as other years which do have a shut off valve. Maybe port 4 ?
Heater core by-pass
