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Thread: HVAC heat blows warm/hot on drivers side, cool/cold passenger side (warranty issue)

  1. #271
    Senior Member Top_Fuel's Avatar
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    Thanks for all the effort you have into this! It's certainly going to help me out since my car is experiencing the same symptoms.

    Quote Originally Posted by Daox View Post
    Without further ado, here are the test results...
    Well...I think that pretty much confirms that there is apparently some issue/defect with the factory heater core. It's either corrosion or a restricted path through the core due to a manufacturing flaw. At least that's what I'm thinking. It's hard to believe it's corrosion when these cars are so new. Let us know how your follow-up testing goes.

    This looks like an $800+ dealer repair...so people will want to test their own vent temperatures BEFORE their warranty runs out. For me that's going to happen by the end of this winter.


    ...thinking about the best way to open it up without getting metal shavings into the end tanks of the core.
    Before you open it up, maybe flow some hot water through it to see if if you can observe any obvious temperature variations or cold spots.


        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 51.2 mpg (US) ... 21.7 km/L ... 4.6 L/100 km ... 61.4 mpg (Imp)


  2. #272
    Administrator Daox's Avatar
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    I've added my previous test data:

    For reference, the ambient temperature was 25F, and the coolant was about 170F.

    Here are the readings I got:

    125 - 98 - 89 - 79

    Attachment 10576
    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

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.4 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.6 mpg (Imp)


  3. #273
    Administrator Daox's Avatar
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    I should also add that my airbag light is now on. I assume this is from running the car without the airbags connected. I'm hoping that I can fix this with etacs decoder. The scangauge can not reset the airbag light.

    edit: or reading here shows its not uncommon to hit a connector under the passenger seat. I'll check that out tomorrow.
    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

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.4 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.6 mpg (Imp)


  4. #274
    Administrator Daox's Avatar
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    It was ~50F and rainy on the way to work today. I turned the heat on with the coolant temp at about 135F which is right around when the coolant light turns off on the dash. It blew nice warm air. I used to have to wait until the coolant temperature was around 150F to get anything usable out of it. Of course, that recollection was probably more from winter. However subjective it is, it does seem to be a good improvement.
    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

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.4 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.6 mpg (Imp)


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  6. #275
    Administrator MetroMPG's Avatar
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    Nice to hear. Hopefully the airbag light isn't a pain to solve.

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


  7. #276
    Administrator Daox's Avatar
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    Tonight I chopped up the heater core!

    I did it the right way, no saws or drills. So, there was no metal particles made in the chopping. I was able to puncture the end of the end tanks on the core. Then, I used a tin snips to go around the perimeter and remove the end tank completely. The whole process was really quick and easy since its all made of aluminum.

    So, lets get on with it!

    Here is the core, purdy!

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    I punched a hole in the end with a center punch tool.

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    That gave me enough room to jam the tin snips in the end and start the can opening process. This is the outlet side of the core for reference.

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    The first glimpse of something wrong...

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    A little further.

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    That surely looks like it would block coolant flow.

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    And here it is fully opened up. Now, the bottom of the picture is actually the top of the heater core as it sits in the car. Not sure what significance that has, but I'm adding it.

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    I also opened up the inlet side of the core. It looked surprisingly good. Maybe a little bit of gunk on the passenger side of the core, but not bad.

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    So, here are a few more shots of the outlet side again. The gunky stuff feels kind of like a thinner version of Vaseline. I would imagine that a good hard blast of water SHOULD be able to dislodge it. However, this didn't seem to work all that great for me when I tried it last winter. I'm not sure how much temperature effects the viscosity of the gel though. Perhaps a good blast of warm water would do it? As I found out, CLR does not touch this stuff.

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    Last, but not least, I wanted to check out what those turnable connections looked like. Pretty simple setup.

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    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

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 45.4 mpg (US) ... 19.3 km/L ... 5.2 L/100 km ... 54.6 mpg (Imp)


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    Senior Member 01-7700's Avatar
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    very interesting! are you going to try to see what it takes to dissolve or dislodge the goo ?
    Skills: Cage fighting, computer chatting, making sweet moula

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        click to view fuel log View my fuel log 2014 Mirage 1.2 manual: 37.6 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.2 mpg (Imp)


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    Good idea... what if a rinse in some solvent is all that's needed for some owners to solve this in the future?


    Nice CSI work, Tim!

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage base ES 1.2 manual: 54.0 mpg (US) ... 23.0 km/L ... 4.4 L/100 km ... 64.9 mpg (Imp)


  12. #279
    Senior Member Cobrajet's Avatar
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    Quote Originally Posted by MetroMPG View Post
    Good idea... what if a rinse in some solvent is all that's needed for some owners to solve this in the future?


    Nice CSI work, Tim!
    /\ This. Let me know what I have to fill my heater core up with to dissolve this gunk before I blast it out with water so I don't have to pull my dash!

    Might be something as simple...and cheap...as rubbing alcohol or lighter fluid.

  13. #280
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    Looking at those pix, it seems there may have been a small air bubble on the top right side...

    That might explain the stuff lodged right there and otherwise nowhere else.
    Is that gunk deposit more like calcium scale in a water boiler, or gooey/slimey a bit like jello like from adding a small amount of a wrong sort of antifreeze?

    I know you bought it used, but can you confirm or try to find out if someone added some (wrong or different sort of) antifreeze?
    On mine a major repair had the head taken off. The coolant was thoroughly flushed to get rid of any old stuff, and was refilled with Glysantin G30 plus distilled water.


    Last edited by foama; 10-03-2018 at 07:51 AM.

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