Heater Control Valve Idea

Heating, Cooling & AC

  1. carfreak6970

    carfreak6970 New Member

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    Hello,

    Would there be any interest in a rebuild-able heater control valve?

    I have a 70 Polara that I would like to take on a road trip to the beach one day and my old man was always hesitant on taking that car to far from home due to the heater control valve and its proneness to cracking. He was concerned that you could carry a spare but that one may not even be good.

    I have access to 3D modeling software and a machine shop. My background is in mechanical engineering, specifically designing valves. I was thinking of seeing if I can get one design and tested to hopefully use easily sourced seals.

    Thoughts?
     
  2. david hill

    david hill Active Member FCBO Gold Member

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    If you can replicate the OE control valve performance there are too many applications it would cover. An excellent choice as many of us could use them. With your engineering skill I'm all for it.
     
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  3. Chrome58

    Chrome58 Member

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    AFAIK, universal ones are already on the market.
     
  4. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    If you do build one, the two suggestions I would have would be to make it look like the original plastic version and shut off both inlet and outlet rather than just the inlet. I understand that might not be possible, just adding food for thought.
     
  5. Carmine

    Carmine Old Man with a Hat FCBO Gold Member

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    H1949.jpg
    All-metal replacement has been the only thing on shelves for decades.
     
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  6. live4theking

    live4theking Old Man with a Hat

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    If you choose to pursue this and you need help with seals you should contact AJ at Sealing Specialist and Services in Glenshaw. He's a great guy and like to do unique things.
     
  7. CBODY67

    CBODY67 Senior Member

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    After I replaced trouble-prone OEM valve with the aftermarket one, I noticed that the vacuum bleed in the dash control (factory a/c), for the temp adjustment, would vibrate at certain throttle positions. I could vary the sound with just a change of vacuum levels. Apparently the smaller vac diaphragm on the aftermarket unit didn't dampen the vacuum pulses from the intake manifold vac feed as well as the OEM unit did. Worked well, past that.

    That was in the later '70s.

    As for a single-hose vacuum controlled valve, GM has several applications of those.

    Check the applicability of an exact repro unit and related copyright/patent issues, too. Making it with a license from Chrysler/FCA, but with improved materials, might be a better option.

    CBODY67
     
  8. ceebuddy

    ceebuddy Active Member

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    Not wanting to crash this thread, but two observations:

    - After replacing the original unit with the Everco H1949 all-metal unit depicted above I noticed I couldn't keep a steady temperature from the heater in my 1971 Sport Fury. I was always readjusting the lever trying to keep a constant temperature.

    - Note that the Mopar valve (and also the Everco H1949) has different diameter inlet/outlet hose nipples on the actual valve, probably making it difficult to replace these with GM or other aftermarket units.
     
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  9. ceebuddy

    ceebuddy Active Member

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    I think the original valve is cleverly designed in that it allows a blending of the incoming hot water with the colder water flowing back to the engine, making for a more constant temperature at the heater. This might explain my observation using the Everco unit as described in my previous post. I remember opening an old (cracked) Mopar valve and trying to figure out how the water flows, but I forgot to take a picture. Does anyone have an old/leaking unit to open up and look into?
     
  10. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    I don't know. After reading the FSM on my '70, I think it just restricts flow to the heater inlet. The aftermarket piece does this and, interestingly enough, the auto-temp heater valve just works on the inlet side with a straight through connection to the outlet.

    Of course, I've never had one of those valves apart so that's just really speculation on my part. I do have to wonder if the water flowing back to the block would be that much cooler that adding a mixing valve to the system would be worth the cost.

    Interesting stuff!

    Myself, I just want the water in the heater core not to be hot when the A/C is on. :thumbsup:

    I thought about using this valve, but after what I could find, the valve shown works backwards from the original valve with vacuum applied stopping flow rather than vacuum applied creating flow. Optional Heater Control Valve for Better AC cooling.

    I went with a small manual valve in the line for summer operation after the vacuum valve to be sure the flow is completely stopped. The A/C in my 'vert is only used when it's too hot for the top to be down and maximum cold is desired.
     
  11. commando1

    commando1 Sergeant at Arms FCBO Gold Member

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  12. Big_John

    Big_John Illegitimi non carborundum FCBO Gold Member

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    I had a big old nasty ball valve from an air line until I found a decent replacement at the price I wanted to pay. I remember lifting the hood at Carlisle for someone and getting a "WTF?" look.

    I have one of these in the line now... and I seem to remember first seeing one in some Florida guy's two tone Formal. :poke:

    s-l500.jpg
     
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  13. Nadir Point

    Nadir Point New Member

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