Ac heater control valve

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71Demon

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Can anyone tell me where I can get this valve? I’m assuming that this is the correct original for my 71 Duster 340 ac car?

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There are replacements that function the same but look different. I used one, it doesn’t have a mounting flange, so I zip tied it to the heater hoses. The part numbers are UAC 1021 and UAC 1022. One flows with the vacuum on and one flows with the vacuum off. I don’t remember which is which and which which of them is correct for us. I will see if I can find a part number on mine.
 
Heater control valve for 1971 Duster is 3579173. Go to search feature on this site and type heater control valve dated May14-16. All numbers shown will interchange with each other including 1971 and 172 Duster. Check the various numbers on eBay.
 
If you don't care about OEM look, a photo of the water valve I put in my 1964 Valiant. I think it is OE for a recent Ford. I added a copper tube to route the other hose, to keep both off the valve cover. My slant-six has solid lifters, so removing the valve cover to adjust valves is a regular task. I have knee-knocker AC, so not essential to shut-off the heater core flow since in the different OEM climate box with own fan, but seemed wise while restoring. I had to tap into a wire inside the knee-knocker which is hot when AC on, which actuates the little vacuum switch beside the water valve. Same setup in my 1965 Dart and Newport. I retrofit my 1984 M-B 300D the same way since its electric "mono-valve" is erratic and expensive to repair, and later M-B used the same vacuum switch - valve setup. I used a different metal valve w/ gold chromate finish in 2 cars. Both type were ~$10 on ebay and both have a spring return, instead of the push-pull dual vacuum hoses I recall 1960's Mopar factory AC water-valves used. The vacuum switch shown is from a 1980's Dodge (have a box full). I used a smaller, cuter one for a Porsche on one car (cheap on ebay).

In case someone wonders, in the background on right is a GM coil to nearby 8-pin HEI module. On left is a 1970's Mopar Vreg. It seems smarter to mount that beside the alternator, instead of far away on the firewall as OE, to minimize wiring and make trouble-shooting simpler.

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crewchief said:
I hate to say this but I found a GM part that was the same except no mounting flange and the vac nipple was angled. Otherwise it works just fine. I'm sure it was a valve manufacturer that made those valves for many auto makers. OEM# 1259327
Click to expand...

Then you might be able to re-use the old mounting flange on the new one with some craftsmanship and ingenuity.
 
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