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Thread: Heater core coolant shut off valve

  1. #11
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    Quote Originally Posted by ahausheer View Post
    Any updates on this old thread?


    See:

    https://mirageforum.com/forum/showth...-heats-the-car





    The older Mirage's had a different heater assembly.
    Air passing through the heater assy was heated at least 5C over outside temperature, regardless of the heat being turned off. The flap covering the core inside the heater box was fully closed and yet the car was always being heated.
    Newer Mirage's, dunno since when, have a modified heater flap, presumably because of that.

    There are basically two sort of designs in cars. First type has a " hot water tap" regulating hot water going through the heater core, but this is not on our cars. Second way to do it is by an air-flap over the heater core, the core itself always being heated, just as in our cars.

    Since my 2014 model has the old unmodified kind of flap inside the heater assembly, which heats even in summer, I disconnected the heater core from circulating coolant by means of a "U"-shaped piece of pipe. Coming winter it will be reconnected in order to re-enable heating.

    A word of warning: Do not simply block it off, because the coolant must continue to circulate through the throttle body and other parts for example.


    Last edited by foama; 08-18-2019 at 08:35 AM.

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    ahausheer (08-18-2019)

  3. #12
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    The coolant will still go through the TB, and other accessories with out going through the heater core, my idea is if the core isnt at 200F then the evap will work more efficiently because the entire AC box wont be heating up. The AC will always cool at full blast, and the heat will always heat at full blast. Your A/C and Heat knob only adjust the flow of cold vs hot air from the vents, but the components run at full duty cycle when ever turned on

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        click to view fuel log View my fuel log 2018 Mirage Es 1.2 manual: 41.6 mpg (US) ... 17.7 km/L ... 5.7 L/100 km ... 50.0 mpg (Imp)


  4. #13
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    That's a good point!
    Especially so if the core already heats the inside without the heat being turned on.
    That was the problem with mine, and reason for the following thread:

    https://mirageforum.com/forum/showth...-heats-the-car

    I didn't see enough space for installing a valve type setup, so I built that "U" shaped tube, and have to connect/reconnect for adapting to the season of the year.
    Last edited by foama; 08-20-2019 at 07:25 AM.

  5. #14
    Senior Member stevedmc's Avatar
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    Back when I still had my 65 Mustang, I put one of these on the line going into the heater core. Simple and it got the job done.

    https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds

    During the summer I closed the valve and during the winter I opened the valve.

    My Mustang didn't have air conditioning, so shutting off coolant to the heater core and rolling down my windows was the only way to keep cool during the summer.

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    Fummins (08-20-2019)

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    Quote Originally Posted by stevedmc View Post
    Back when I still had my 65 Mustang, I put one of these on the line going into the heater core. Simple and it got the job done.

    https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds

    During the summer I closed the valve and during the winter I opened the valve.

    ...shutting off coolant to the heater core and rolling down my windows was the only way to keep cool during the summer.

    Great for a Mustang, but no good for our cars, because the flow must not be interrupted.
    You just need to detour the flow to pass around the heater core.

  8. #16
    Administrator Daox's Avatar
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    You will want a 3 way heater control valve to do this properly. Shouldn't cost much. Most cars have these valves for the reasons we have seen already.
    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

    Current project: DIY Nitrous oxide setup for ~$100

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  9. #17
    Senior Member Fummins's Avatar
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    Quote Originally Posted by stevedmc View Post
    Back when I still had my 65 Mustang, I put one of these on the line going into the heater core. Simple and it got the job done.

    https://shop.advanceautoparts.com/p/...E&gclsrc=aw.ds

    During the summer I closed the valve and during the winter I opened the valve.

    My Mustang didn't have air conditioning, so shutting off coolant to the heater core and rolling down my windows was the only way to keep cool during the summer.
    I miss old stuff in some ways. Kick panel vents and wing vent window things!


    Truck
    POS Nissan
    Optima

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    poorman1 (08-21-2019)

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