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

  1. #191
    Fingers crossed.

    I'm also going to update the thread title to indicate this can be a warranty issue.


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  2. #192
    Administrator Daox's Avatar
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    Quote Originally Posted by Wallythacker View Post
    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)
    When testing, you want to use fresh air, not recirculate. It'll give you a larger differential since the intake air is colder.
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  3. #193
    Senior Member 01-7700's Avatar
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    Success!

    145F left -- 150F middle -- 130F right -- 20F outside

    $0 cost

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    Did not get the old core to dissect.
    Last edited by 01-7700; 01-23-2018 at 10:16 AM.
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  5. #194
    Senior Member Wallythacker's Avatar
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    Quote Originally Posted by Daox View Post
    When testing, you want to use fresh air, not recirculate. It'll give you a larger differential since the intake air is colder.
    Oops, my bad. I'll run the tests again on fresh mode.
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  6. #195
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    Quote Originally Posted by 01-7700 View Post
    145F left -- 150F middle -- 130F right -- 20F outside
    Hmmm...so here's a car with a NEW heater core and there's still a 15 degree difference from side to side?

    I don't remember what your original numbers were, but did you notice a significant improvement in the way anything feels?

    I'm still wondering if there's really a problem, or is this just the way the heat functions in these cars due to the design of the heater box. A 15 degree difference is pretty close to what I have now. Out of fear of getting stuck with an out-of-warranty expensive repair, I may have mine done even though I'm not confident there's a problem.


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    So if you want to get the attention of the service manager, just mention that your defroster doesn't work. I'll have to remember that.

    I'm assuming the tech didn't test your heater core, but they put that on the work order to keep the Mitsubishi warranty auditors happy.

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  8. #196
    Senior Member 01-7700's Avatar
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    Quote Originally Posted by Top_Fuel View Post
    Hmmm...so here's a car with a NEW heater core and there's still a 15 degree difference from side to side?

    I don't remember what your original numbers were, but did you notice a significant improvement in the way anything feels?

    I'm still wondering if there's really a problem, or is this just the way the heat functions in these cars due to the design of the heater box. A 15 degree difference is pretty close to what I have now. Out of fear of getting stuck with an out-of-warranty expensive repair, I may have mine done even though I'm not confident there's a problem.


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    So if you want to get the attention of the service manager, just mention that your defroster doesn't work. I'll have to remember that.

    I'm assuming the tech didn't test your heater core, but they put that on the work order to keep the Mitsubishi warranty auditors happy.
    To tell the truth, initially it felt cooler than what I remember but that memory could be from warmer times. I swear it used to be so hot that I could fry bacon. It's plenty hot now and my memory is probably being selective.

    As far as differing temps, I assumed this is because there is laminar flow coming through the core. The passenger side is getting warmed from the cooler side of the core. Not enough mixing going on to equalize the temperatures. I think the key is how cold the cold side is and in my case it was genuinely uncomfortable driving around with a coat and gloves on when it was -10F outside. The comment about the defroster not working seemed to get their attention the best, as it should.
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  10. #197
    Senior Member Top_Fuel's Avatar
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    Quote Originally Posted by 01-7700 View Post
    As far as differing temps, I assumed this is because there is laminar flow coming through the core. The passenger side is getting warmed from the cooler side of the core. Not enough mixing going on to equalize the temperatures.
    That's a logical/reasonable assumption. I think the jury is still out on the "blocked heater core" theory.

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  11. #198
    Administrator Daox's Avatar
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    When they/you tested those outlet temperatures, how cold was it outside? Also, how long was the heat blowing? Those are very good temperatures. As I mentioned, my 04 Civic only blew air temps about 130ish at full blast (but 130ish out of all the vents, temp distribution was pretty even). It makes sense the center vents blow warmer because its a shorter run from the core to the vent outlet.
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  12. #199
    Senior Member 01-7700's Avatar
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    Quote Originally Posted by Daox View Post
    When they/you tested those outlet temperatures, how cold was it outside? Also, how long was the heat blowing? Those are very good temperatures. As I mentioned, my 04 Civic only blew air temps about 130ish at full blast (but 130ish out of all the vents, temp distribution was pretty even). It makes sense the center vents blow warmer because its a shorter run from the core to the vent outlet.
    My measurements were made after driving ~ 20 miles / 40 minutes ~ 20F outside. Heat on 89F auto the whole way, then I redirected to the dash after parking at home. I let the temp stabilize in the vents but the engine was idling at the time of measurement.
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        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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    Quote Originally Posted by Top_Fuel View Post
    Just curious about what model years your cars are and the mileage on each one?
    Both are 2015 DE models. Mine is a 5 speed and hers is a CVT ... Both have 33,000 to 35,000 miles on them. The only difference in driving conditions is that I do a lot of the highway (vacation) driving. We've done some long traveling in my car: Chicago to Florida, Chicago to New Orleans, Chicago to North Carolina then Pittsburgh and back.


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