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

  1. #181
    Senior Member Wallythacker's Avatar
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    My thermometers arrived. It's supposed to be 26F tomorrow. I'll post my findings then.


    Zero, 2014 ES Plus 5MT, written off but not forgotten.
    Zero II, 2014 SE, 5MT, climate She's HOME now!
    Shelby AKA "Cute", 2017 ES 5MT, A/C.

    Mirage owners look at the world differently than everyone else, but in a better way
    We're driving the Beetle of the 21st century, the greatest small car now available!

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        click to view fuel log View my fuel log 2017 Mirage ES PLus 1.2 manual: 39.0 mpg (US) ... 16.6 km/L ... 6.0 L/100 km ... 46.8 mpg (Imp)


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    I own two mirages, so it has been nice being able to compare the heat issue. My car currently has this issue but my wife's car doesn't. I didn't even notice until she kept saying her feet were cold when she got into my car. I'm coming to the same conclusions about the heater core... although I'm also interested to see if a thermostat fixes the issue but I don't think it will.

    Same issue: The driver's side is very hot and the center vents differ a little bit but the passenger's side vent and floor vent get pretty chilly. I did notice that the heat DOES RETURN to both sides equally when I rev the engine up to 5,000 RPMs for about 30 seconds. The drivers side temp doesn't change much but the passenger's side gets to be just about equal temp to the driver's side. I think that's a pretty good indication of poor heater core flow.

    I'm pretty convinced that the heater core need to be replaced and that flushing it will not help. BTW, I've never added any coolant since it left the dealership, or let anyone else touch it so I'm pretty sure its not a coolant issue.. in my case at least.

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        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 43.3 mpg (US) ... 18.4 km/L ... 5.4 L/100 km ... 52.0 mpg (Imp)


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  5. #183
    Administrator Daox's Avatar
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    Thanks for the info eulogylife! That is quite helpful.
    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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        click to view fuel log View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)


  6. #184
    Senior Member Wallythacker's Avatar
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    Here's my preliminary findings,

    Fan on 4, air control set to dash only, external air set to recirculate,
    The driver's side reached 154F, Passenger side reached 143, center not measured.

    These temps were grabbed quickly with the car parked, I plan on more elaborate measurements when I have more time.
    Zero, 2014 ES Plus 5MT, written off but not forgotten.
    Zero II, 2014 SE, 5MT, climate She's HOME now!
    Shelby AKA "Cute", 2017 ES 5MT, A/C.

    Mirage owners look at the world differently than everyone else, but in a better way
    We're driving the Beetle of the 21st century, the greatest small car now available!

        __________________________________________

        click to view fuel log View my fuel log 2017 Mirage ES PLus 1.2 manual: 39.0 mpg (US) ... 16.6 km/L ... 6.0 L/100 km ... 46.8 mpg (Imp)


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  8. #185
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by eulogylife View Post
    I own two mirages...My car currently has this issue but my wife's car doesn't.
    Just curious about what model years your cars are and the mileage on each one?

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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


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  10. #186
    Quote Originally Posted by eulogylife View Post
    when I rev the engine up to 5,000 RPMs for about 30 seconds.
    Why stop at 5000rpm?
    Mirage videos:

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        click to view fuel log View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)


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  12. #187
    Moderator inuvik's Avatar
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    Quote Originally Posted by Fummins View Post
    Why stop at 5000rpm?
    Yah, It's great for engines to rev up with no load for extended periods of time!

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.5 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.6 mpg (Imp)


  13. #188
    Senior Member Wallythacker's Avatar
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    My second set of findings are in. As the ambient temp was higher, about 38F, the results were up. I didn't test the center outlet nor did I try a mix of outlets. I set the control for dash only and recirculate.

    The passenger side was 162F and the driver side was 166F. Engine speed was about 3500 rpm. I was tooling around town at speeds of about 35-40mph. So based on my latest tests the '17 series passes with flying colors.

    It will be interesting to test again once temps plummet (if they do again, this is a weird winter)
    Last edited by Wallythacker; 01-21-2018 at 11:32 PM.
    Zero, 2014 ES Plus 5MT, written off but not forgotten.
    Zero II, 2014 SE, 5MT, climate She's HOME now!
    Shelby AKA "Cute", 2017 ES 5MT, A/C.

    Mirage owners look at the world differently than everyone else, but in a better way
    We're driving the Beetle of the 21st century, the greatest small car now available!

        __________________________________________

        click to view fuel log View my fuel log 2017 Mirage ES PLus 1.2 manual: 39.0 mpg (US) ... 16.6 km/L ... 6.0 L/100 km ... 46.8 mpg (Imp)


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  15. #189
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Wallythacker View Post
    ...passenger side was 162F and the driver side was 166F.
    ...based on my latest tests the '17 series passes with flying colors.
    Interesting. I would definitely run those tests again if/when temps plummet. It seems like the issue is harder to detect when outside temperatures are warmer.

    Still waiting for 01-7700 to post his findings after he gets a new heater core tomorrow...

        __________________________________________

        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 52.2 mpg (US) ... 22.2 km/L ... 4.5 L/100 km ... 62.6 mpg (Imp)


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    Senior Member 01-7700's Avatar
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    The Mirage went into surgery early this morning they said it would take all day. Getting my car back tonight might be an issue if it takes longer than their shuttle service is running.


    Skills: Cage fighting, computer chatting, making sweet moula

        __________________________________________

        click to view fuel log View my fuel log 2014 Mirage 1.2 manual: 38.0 mpg (US) ... 16.1 km/L ... 6.2 L/100 km ... 45.6 mpg (Imp)


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