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

  1. #321
    Administrator Daox's Avatar
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    I tested my vents when I got to work this morning. Ambient temperature when I left home was 18F. I have a 25 minute commute. My coolant temperature was 190F when I started the test, and 177F when I ended the test. The test took only a few minutes. I used the multimeter I've shown previously. It has a k-type thermocouple to measure temperature. Once I got to work, I put it in neutral, put the heat to 89 and fan to max. I inserted the temp probe in the far passenger side and the temperature got up to 137F. I then moved it to the driver's side and it got up to 137F. Granted, the coolant temperature was dropping. So, if I could measure both, I would have to say that the driver's side is probably 1-2F, and maybe 3F at the maximum. I then tested it again. I moved the temperature probe to the passenger side again and it went up to 135F. Then, again to the driver's side and got 134-135F.

    I'd say if you have more than 10F variation, you definitely have an issue. A small issue at that point, but an issue.


    Custom Mirage products: Cruise control kit, Glove box light, MAF sensor housing, Rear sway bar, Upper grill block

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        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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    Top_Fuel (01-22-2019)

  3. #322
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Daox View Post
    I'd say if you have more than 10F variation, you definitely have an issue.
    Thanks for running that test! Based on the testing of a low-mileage 2017 and your recent tests, I agree. A Mirage with a "clean" heater core should not have a significant (10+ degrees) variation from side to side.

    My car would not produce anywhere near 137 on the passenger side if it was 18F outside. I'm probably a good 25 degrees below that.

    My latest testing numbers are probably on the high side. One thing I wasn't watching was my coolant temperature. I run all my tests at a 60 mph cruising speed. With a 100% grill block and 12 degree ambient temperatures yesterday, my coolant temperature would reach 205+ with the engine under a slight load. Take away the grill block and my coolant temps would drop to 195. Not a big deal, but the grill block is probably making my heat output warmer than it actually is.

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        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)


  4. #323
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    Well I decided to test my heater output tonight, while on the way home from work. 14 deg F, 45-50 mph, temp set to 89, max fan and all output coming from the top vents. Got a reading of 147 on the far left drivers side vent & 111 on the far right passenger vsnt. Looks like I probably have an issue too. 2014 ES model.

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    MetroMPG (01-31-2019),Top_Fuel (01-31-2019)

  6. #324
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by Car Nut View Post
    ...I decided to test my heater output tonight
    ...14 deg F, 45-50 mph, temp set to 89, max fan and all output coming from the top vents
    ...147 on the far left drivers side vent & 111 on the far right passenger vent
    Congratulations...you've got it the classic symptoms:

    1. Low temperature output on passenger side
    2. Wide (20+ degree) temperature spread between the driver/passenger side


    In a place like Virginia you might be fine 360 days of the year. Are you still covered by the 5 year/60,000 mile warranty?

    So for the heck of it, I ran the same test in one of my other cars. I have a 1-owner 1999 Mitsubishi Eclipse (2.0 non-turbo) that we bought brand new. It has 170,000 miles and has its original heater core. When I run this test in that car (close to 0F outside), I get almost 150F from all the vents...and the temperature actually gets hotter on the passenger side. This is what you would expect since that's where the heater core is located!

    Here's a pic for Eggman... Hate to see the car this dirty but this is the best I can come up with right now...

    Name:  1999 Eclipse 001.jpg
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    Last edited by Top_Fuel; 01-31-2019 at 05:05 PM.

        __________________________________________

        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)


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    Eggman (02-01-2019),inuvik (02-01-2019)

  8. #325
    Moderator Eggman's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    I have a 1-owner 1999 Mitsubishi Eclipse (2.0 non-turbo) that we bought brand new.
    Pictures!

        __________________________________________

        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)


  9. #326
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    No warranty on mine. I picked this car up as an insurance total and rehabbed it by hanging a drivers fender and door, reworking the driver rear door, and an complete repaint. Only thing I can get done is safety recalls. So far I've experienced the starter issue, and now this. Both can be expensive. I guess when the cvt trans goes, I'll just part it out and get something else. Thank God I haven't had the axle problem too.



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