Heater water control valve

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KJM

Member
Joined
Aug 23, 2012
Messages
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Location
Ohio
My Car
1971 mach1,351w auto
71 with A.C. ,Can't find this answer online ,Is the water control valve open or closed with no vacuum applied to it.

 
That looks like one of those medical problems, lol. I kept two solid plugs to go in the ends of hose.
BTW if you put new core in and it is aluminum add a ground wire to prevent early failure. Ford sent a service bulletin in the 80's about the issue.
Is the aluminum or copper one better? 

 
It's been a while since I've been into the heater/AC system, but I believe the heater valve is always open, all except for when the A/C is selected on the dashboard slider, which sends vacuum to the valve to shut off hot water when cooled air is running through the heater/AC box. Anyone else find this to be true?

 
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