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

  1. #101
    Moderator inuvik's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    I've often wondered how the system actually works. My philosophy is that I want the HVAC doors to operate as minimally as possible...because the more they move, the more they are likely to fail over time.

    So I never use the AUTO setting, I always have the air coming out of the dash vents, and the temp is always set to 89 in the winter. I assumed this would always keep the blend/mode doors in the same position...with maximum airflow over the heater core. I have no idea if this is actually how it works or not. The service manual can be frustrating when you want a text explanation of how something like this works.
    I keep mine set at 80 with the flow set to defrost/feet with the fan set on 3 bars. Doesn't run the AC compressor. I'll turn on the AC momentarily to provide extra defrosting the windshield but most of the time it's not necessary. I never use the auto feature also.


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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 automatic: 40.6 mpg (US) ... 17.2 km/L ... 5.8 L/100 km ... 48.7 mpg (Imp)


  2. #102
    Administrator Daox's Avatar
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    I also never use the auto feature. However, I switch modes and fresh/recirculate depending on what I want.
    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: 45.7 mpg (US) ... 19.4 km/L ... 5.1 L/100 km ... 54.9 mpg (Imp)


  3. #103
    Senior Member 01-7700's Avatar
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    I use the AUTO feature frequently on my short trips but turn it off by slowing down the fan on longer trips.

    So, there is no valve on the coolant within the heater box from what I can see.

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    Maybe there is an actuated valve on one of the heater hoses on the engine? I wish I could go out and take a look right now but I'm at work.
    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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    Daox (12-27-2017),Eggman (12-27-2017),Fummins (12-28-2017)

  5. #104
    Administrator Daox's Avatar
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    There is no heater control valve. I checked when I did my block heater install. I've also check the service manual and found no mention of one.



    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: 45.7 mpg (US) ... 19.4 km/L ... 5.1 L/100 km ... 54.9 mpg (Imp)


  6. The Following 2 Users Say Thank You to Daox For This Useful Post:

    01-7700 (12-28-2017),Top_Fuel (12-28-2017)

  7. #105
    Senior Member 01-7700's Avatar
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    I also looked for a control valve and didn't find one.

    So coolant is always flowing through the heater core while the engine is running at operating temp. How could it clog?
    Skills: Cage fighting, computer chatting, making sweet moula

        __________________________________________

        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)


  8. #106
    Senior Member Fummins's Avatar
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    I could be wrong but if the heater core were to get plugged, it would happen at the far end/rh side of the core. Everything flows the path of least resistance. In the heater core pic that 01-7700 posted, it looks like if any junk was to flow into the core, it would likely flow to the end of the core first before flowing through the narrow tubes. I've seen a lot of plugged cores(not in a mirage) and I'm willing to put my money on that. They are cheap enough to gamble to try. But not something you wanna do in the cold. In the meantime you could get one of those little 12volt heaters that sit on the dash or put cardboard in front of the rad?

    And there is no shut off valve stopping coolant flow to the heater core.

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  10. #107
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by 01-7700 View Post
    ...coolant is always flowing through the heater core...How could it clog?
    The passages clog most often because of corrosion...just like in a radiator...

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    Now...I'd like to think that these cars are way too new to have anyone worrying about a corrosion issue at this point.

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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 51.2 mpg (US) ... 21.8 km/L ... 4.6 L/100 km ... 61.5 mpg (Imp)


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    01-7700 (12-28-2017)

  12. #108
    Senior Member 01-7700's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    The passages clog most often because of corrosion...just like in a radiator...

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    Now...I'd like to think that these cars are way too new to have anyone worrying about a corrosion issue at this point.
    I would also like to think that
    Skills: Cage fighting, computer chatting, making sweet moula

        __________________________________________

        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)


  13. #109
    Senior Member 01-7700's Avatar
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    I've got a bore scope on the way and plans to look at the actuation of blend doors when I get it. The shop manual shows how far the doors should open and close from outside the heater box on both sides.

    mixing door

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    mode door

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    outside air door

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    Skills: Cage fighting, computer chatting, making sweet moula

        __________________________________________

        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)


  14. The Following 4 Users Say Thank You to 01-7700 For This Useful Post:

    daleWV (12-29-2017),Daox (12-28-2017),Top_Fuel (12-28-2017),Wayne (12-29-2017)

  15. #110
    Moderator Eggman's Avatar
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    Daox I wonder if your camera would fit inside the heater core inlet.


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        click to view fuel log View my fuel log 2015 Mirage ES 1.2 manual: 50.0 mpg (US) ... 21.3 km/L ... 4.7 L/100 km ... 60.0 mpg (Imp)


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    Daox (12-28-2017)

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