DS heater valve repair?
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Thread: DS heater valve repair?

  1. #1
    Fellow Frogger! mberry's Avatar
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    Default DS heater valve repair?

    Has anybody repaired the DS heater valve? I understand the seal goes and the valve leaks. Assuming this is the problem can the valve seal just be replaced thus fixing the heat leak. I know the whole valve assembly can be replaced easily enough for $170.00 but if a new seal would do the trick I think I would happily try that first....... Think this may have been why the 1970 was so much hotter in summer than the 69.

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    Some of them have a waxstat type unit inside it that is also linked to a Bourdon tube and is meant to regulate the temperature of water passing the heater core. Nice idea in theory, but if that's no good or the plastic body is brittle, changing the seal will not bring it back to work as intended. Most people have no great need for the heater and can just bypass the core with a piece of scrap tube. Cheapskates might be able to adapt a cheaper part with simple manual operation as used on some UK cars of the 1960's, similar to the Jaguar MkII style.

  3. #3
    1000+ Posts driven's Avatar
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    Check out this site for heater control valve ideas

    Metrix W0133-1903396 Heater Valve | Auto Parts Warehouse

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    Fellow Frogger! rmac's Avatar
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    I had two valves broken due to the plastic becoming brittle. A friend had a tinker and replaced the broken pieces with poly fittings. One he was able to thread and attach. THe other required some heat resistant adhesive that was used to bond the replacement part in place.

    Prior to this I used a 6" piece of aluminium tube to bypass the heater matrix.
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    Fellow Frogger! mberry's Avatar
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    Thank you gentlemen. Wishful thinking on my part, will get new valve unit and replace old unit, not that I really use the heater, but will maintain originality.
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    Administrator GreenBlood's Avatar
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    Quote Originally Posted by mberry View Post
    Thank you gentlemen. Wishful thinking on my part, will get new valve unit and replace old unit, not that I really use the heater, but will maintain originality.
    Useless junk only lasted 40 years Colin Smith has just been through this. . . hopefully you'll get another 40 years Michael
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    Fellow Frogger! mberry's Avatar
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    Thanks Chris,
    yes 40 years is pretty good, experience tells me not to expect anything like that from repro heater valve.

  8. #8
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    I suspect it might be a good idea to add a steel backing plate to stop the plastic fitting from bending when it's bolted to the heater core. It doesn't seem all that rigid.

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    Fellow Frogger! rmac's Avatar
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    The foam cushioning my heater matrix has powdered into dust. Will ordinary foam stand the heat or is it special foam?
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    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by rmac View Post
    The foam cushioning my heater matrix has powdered into dust. Will ordinary foam stand the heat or is it special foam?
    I would think an ordinary, like a soft or open cell foam would dry out and crumble away in a short time. Something like a rubber-based padding- like the material used for mouse pads- would be the ticket.

    Do you have any of the original material at all to gauge against? Besides the dust, I mean.
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    Fellow Frogger! rmac's Avatar
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    No unfortunately. I'll try sacrificing an old mouse mat and see what happens. I was more concerned about it melting.
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    Fellow Frogger! mberry's Avatar
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    Default my lucky day

    Went hunting for a spare in the shed. Just a vague feeling I may have had a spare stashed.
    Was fortunate to find it, after cleaning and testing, it works, and seals, as far as I can tell.
    Unsure what kind of pressure it may be subject to, but, certainly worth refitting and testing in the car.

    Now I will disassemble the one from the car and see if I can repair. It's responded well to cleaning, just not sure it is sealing.
    Attached Thumbnails Attached Thumbnails DS heater valve repair?-heater-valve.jpg  

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    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by mberry View Post
    Went hunting for a spare in the shed. Just a vague feeling I may have had a spare stashed.
    Was fortunate to find it, after cleaning and testing, it works, and seals, as far as I can tell.
    Unsure what kind of pressure it may be subject to, but, certainly worth refitting and testing in the car.

    Now I will disassemble the one from the car and see if I can repair. It's responded well to cleaning, just not sure it is sealing.
    The pressure won't be great. No more than system pressure, which IIRC is only 4lbs.
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    Quote Originally Posted by mberry View Post
    Went hunting for a spare in the shed. Just a vague feeling I may have had a spare stashed.
    Was fortunate to find it, after cleaning and testing, it works, and seals, as far as I can tell.
    Unsure what kind of pressure it may be subject to, but, certainly worth refitting and testing in the car.

    Now I will disassemble the one from the car and see if I can repair. It's responded well to cleaning, just not sure it is sealing.
    Subjected pressure will be no more than the pressure rating of the radiator cap Mike.

    John

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    Fellow Frogger! mberry's Avatar
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    All seems well with the replaced heater valve, gave it a good road test last night with no problems. Having been through this exercise I'm taking the small radiator in for a recond. From now on as a matter of maintenance I will flush the heater radiator and clean/descale the heater valve whenever I flush the cooling system. Hopefully that will ensure the longevity of the heater valve. Can't believe I didn't tend to this earlier, had some very hot trips over the summer......

  16. #16
    Fellow Frogger! mberry's Avatar
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    Default The offending seal

    It doesn't look particularly good, but I suspect a new seal can be made. The mechanical mechanism still serviceable. Any thoughts greatly appreciated.
    Attached Thumbnails Attached Thumbnails DS heater valve repair?-img_8073.jpg   DS heater valve repair?-img_8077.jpg  

  17. #17
    Real cars have hydraulics DoubleChevron's Avatar
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    Before you refit it .... make sure you car still has the correct 4psi radiator cap there.... Most have been replaced with whatever is available at the local auto store. 11+psi may well cause the tap to leak where it didn't at 4psi

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    Is there any change when the tube is immersed in hot/cold/hot water? You should be able to get some idea as to whether it might self-regulate when installed or whether it is stuck.

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    Fellow Frogger! mberry's Avatar
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    David, with the one that I have opened up, it was certainly sticking. The rubber seal seems to have deteriorated markedly. I don't expect the heat is moving the plastic tube, it's that extremely hard style plastic that the blower housing is made from. I have a price coming tomorrow for a new seal made from silicone, hopefully doesn't cost more than a poor quality repro. heater valve.

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