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Yea, and these mechanical valves are getting old, the rubber seal maybe leaking but ... if yours is not leaking and looks good it's probably fine. It's run by a cable to your heater control. There really aren't new ones to be had, there was a guy making the rubber part new so it was possible to rebuild them.
If your mechanical heater control is no good, just eliminate it, put in a shut-off valve. I hate heaters blowing hot air in summer.
82warren
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My 55 sunliner had that style of heater control valve but it broke so I installed a 65 to 72 truck style since I was in a hurry to get it fixed.
Butchering up everything I can get my hands on in Dayton Ohio
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I wonder if some were factory installed and some dealer installed ? I know that sometimes people would pick a car that was on the lot rather then ordering one and the dealers would install options that the people wanted that may not have been on the car.
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I believe that type of Heater setup is called a recirculating type. Supposed to be more efficient and it is controlled by a bi-metallic spring in the heater Case. I have the same setup on mine and it was never an A/C Car. Not sure why some Cars have the regular Heater and some the re-circulating type. Was never an Option as far as I know.
 
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So the heat cable controls a valve on the inside of the firewall that this connects to. Possibly a replacement for the vacuum valve in the heater duct?
Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.
 
MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire
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No, my car (55) has no air conditioning. Car in family since new so this is the way it came. Also had a 56 292 with same valve. Valve is cable operated and as Dan said it has a thermostatic coil to regulate the flow of hot water depending on where the cable lever is set.
Ben HessTulsa,OK
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My 1955 Ford station wagon with factory installed air conditioning had that same heater hose Y on it. Is your car a factory air car?
  Lorena, Texas (South of Waco)
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Interesting, I've never seen that, only the valve on the intake. manifold. is that vacuum or cable operated?
I love the smell of burning rubber in the morning!
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Here are a couple of pics. Hope these help. Ben  
Ben HessTulsa,OK
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