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Heater shut off valve?

Discussion in '308/328' started by mixedgas, Nov 4, 2024.

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  1. mixedgas

    mixedgas Formula Junior
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    Apr 23, 2019
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    Mike
    #1 mixedgas, Nov 4, 2024
    Hi there, I'm going through my heater cores and piping and wanted to ask if anyone has ever installed / considered installing a heater shut off valve? If so, where in they system would/did you install it? Goal is to eliminate coolant flow to the heater cores in summer months under the assumption that it would keep the cabin cooler in summer (no heat leakage around valves / ducting flaps etc). Thank you!

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  2. mixedgas

    mixedgas Formula Junior
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    Mike
    #2 mixedgas, Nov 4, 2024
    I was thinking of installing around this location (red dot in this figure). Also wondering if I should install two cut-off valves. Thanks for any thoughts! Image Unavailable, Please Login
     
  3. Rifledriver

    Rifledriver Three Time F1 World Champ

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    Brian Crall
    #3 Rifledriver, Nov 4, 2024
    I did it on my 328. Complete waste of time.
     

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  4. duners

    duners Karting

    Aug 16, 2022
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    Steven Carlson
    #4 duners, Nov 4, 2024
    Seems like to truly isolate would require two valves. One at the heater pipe exit from motor and another at the y return from radiator.
    I thought of shutoff valves for mine and ended up working on ac system. I got the ac working and now it’s keeps me cool. Also, I don’t know how much the heater hose is contributing to the cabin heat compared to the radiator. Like previous poster mentioned - prob not much difference isolating heater hose.
     
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  5. Alden

    Alden F1 Rookie
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    Central Florida
    #5 Alden, Nov 4, 2024
    Last edited: Nov 4, 2024
    I put one on my 88 3.2 Mondial at Tim Stanford's suggestion, when I was at his shop to pick up my car from major service he noticed that hot air was coming out of the vents before it got cool, he showed me a 308 he had in for service where they had put a cut-off valve, a simple ball valve in the left rear wheel arch, mine works great and since I live in Florida I've rarely used the heat, changed the temperature of my AC air from 49° to 39°. I got a 3/4-in ball valve from the hardware store and the bonus is that it has a bleed valve built into it and it's at the high point of my system.
    I know my heater valve was leaking and I probably should have just replaced that, but the service was done and I didn't want to leave the car, so I just installed the manual valve when I got home
    Alden
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  6. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
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    Jan 11, 2001
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    #6 Steve Magnusson, Nov 4, 2024
    Last edited: Nov 4, 2024
    Your model already has manual shutoff valves so, unless yours are broken (or mis-adjusted) and leaking flow, adding another one will make no difference. (Alden's situation is different -- he added a manual shutoff valve because his '88 electric shutoff valve is not working correctly.)
     
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  7. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #7 Rifledriver, Nov 4, 2024
    Mine were not installed for the purpose of lowering interior temp but they dont. As Steve pointed out the factory installed valves. If they are working more is not better.
     
  8. Dr Tommy Cosgrove

    Dr Tommy Cosgrove Three Time F1 World Champ
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    #8 Dr Tommy Cosgrove, Nov 5, 2024
    Why did you put yours in?
     
  9. Rifledriver

    Rifledriver Three Time F1 World Champ

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    #9 Rifledriver, Nov 5, 2024
    A misguided desire to be able to isolate that section of the cooling system in the event of a leak.
     
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  10. Sergio Tavares

    Sergio Tavares Formula 3

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    #10 Sergio Tavares, Nov 5, 2024
    I wiped down all the beautiful valves and plating with wd40 to keep everything cleaned and preserved
     
  11. theunissenguido

    theunissenguido F1 Rookie
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    Guido
    #11 theunissenguido, Nov 6, 2024
    I did the same as Brain....the incoming flow cut. I see Brian did also the return flow cut. You have to do the return flow also otherwise warm water is still coming up to the heater cores.
     

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