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Thread: probably need a heater core - 5yr warranty replacement?

  1. #11
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Johnny Mullet View Post
    ...without damage or mistakes caused by dealership flat rate techs.
    When I had my car at the dealer a couple of years ago, the service advisor told me that they had never done a heater core on a Mirage before. Uh oh...

    I don't have anything against flat rate techs...as long as mine is the 20th heater core they have done...not the first!


    EDIT - Attached to this post is a PDF of a document I wrote and intended to send to Mitsubishi if they tried to hang me out to dry on my heater core. If you need a single document to hand to a dealer outlining the issue, this is a good start. This is the TSB that probably should exist for these cars.


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    Last edited by Top_Fuel; 12-29-2020 at 01:38 AM.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.1 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


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  3. #12
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    Another point to consider:
    The coolant flows through the heater core and then flows through the butterfly assembly. No idea if that fouls up too, and what consequences would be.

  4. #13
    Senior Member spork's Avatar
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    Question

    A little late, but thanks a bunch Top_Fuel! That document was helpful and really well organized!

    So I ended up getting my heater core replaced under warranty. 🎉 Yay! However...

    On my drive home, I noticed the car engine/coolant (measured by ultragauge) was not getting as hot as it should at all. The highest I saw was in the 150s and it should be hanging out in the 190s. Once I was on a highway, the warmup light actually came back ON, and the temp got down to 120ish. As you can imagine, the heat output is also not that great then. The temperature outside was about 15 degrees, and my trip was approximately 20 miles. The paperwork they gave me also states that the thermostat was replaced. Coolant reservoir was full, didn't check radiator (yet).

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 48.3 mpg (US) ... 20.5 km/L ... 4.9 L/100 km ... 57.9 mpg (Imp)


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    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by spork View Post
    ...I ended up getting my heater core replaced under warranty.
    That's good to hear...especially knowing that it was under warranty!

    ...the car engine/coolant (measured by ultragauge) was not getting as hot as it should at all.
    ...The paperwork they gave me also states that the thermostat was replaced.
    Well...that sucks. I guess my first question would be... why did they replace the thermostat during a heater core replacement? It's possible that Mitsubishi tells them to do this as part of the job...or maybe they experienced the same thing you are seeing now (no heat) after they put it all back together...so they just threw a thermostat in it. It wouldn't be the first time a dealership threw parts at a problem without diagnosing it.

    Keep checking the coolant level to make sure it's full. It sounds like either the thermostat still isn't working properly or maybe they didn't bleed all of the air out of the cooling system when they put everything back together?!? An air pocket in the wrong place can cause some strange results.

    In any case, it's not your problem. Take it back and they will have to sort it out.

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.1 mpg (US) ... 22.1 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


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    Quote Originally Posted by spork View Post
    A little late, but thanks a bunch Top_Fuel! That document was helpful and really well organized!

    So I ended up getting my heater core replaced under warranty. 🎉 Yay! However...

    On my drive home, I noticed the car engine/coolant (measured by ultragauge) was not getting as hot as it should at all. The highest I saw was in the 150s and it should be hanging out in the 190s. Once I was on a highway, the warmup light actually came back ON, and the temp got down to 120ish. As you can imagine, the heat output is also not that great then. The temperature outside was about 15 degrees, and my trip was approximately 20 miles. The paperwork they gave me also states that the thermostat was replaced. Coolant reservoir was full, didn't check radiator (yet).
    It's great to hear it got replaced under warranty. Others should take note of that. Sounds like you may have a faulty thermostat or something wasn't done right in the installation. Hopefully, they will get it sorted out for you.

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    Quote Originally Posted by spork View Post

    On my drive home, I noticed the car engine/coolant (measured by ultragauge) was not getting as hot as it should at all. The highest I saw was in the 150s and it should be hanging out in the 190s. Once I was on a highway, the warmup light actually came back ON, and the temp got down to 120ish...
    Typical for very large air pocket in the cylinder head. Hope no damage was done, you will want to check radiator coolant level!

    On mine the thermostat was replaced years ago, an easy simple job. Same thermostat as in SMART car.

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    Senior Member spork's Avatar
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    Angry

    Well, here's my radiator. I've honestly never opened the cap, but if it's like my metros, I'm assuming it should be filled to the top. :/

    Name:  MirageRad.jpg
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        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 48.3 mpg (US) ... 20.5 km/L ... 4.9 L/100 km ... 57.9 mpg (Imp)


  10. #18
    Senior Member Johnny Mullet's Avatar
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    I also suspect an air pocket in the cooling system. Run the car with the cap off and add coolant till full and it reaches operating temp. Shut off and let it cold soak and check again.
    Check out my latest project........

    Mullet's Skoolie Build

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  12. #19
    Senior Member spork's Avatar
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    Also discovered they put in green coolant instead of the blue... Since I can't see any coolant in the radiator, I stuck a paper towel down the reservoir.

    Name:  MirageCoolant.jpg
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        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 48.3 mpg (US) ... 20.5 km/L ... 4.9 L/100 km ... 57.9 mpg (Imp)


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