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Thread: 2015 3 GT Heater Core

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    Default 2015 3 GT Heater Core

    Just curious to see if anyone is having longer than normal operation of the heater core in this beautiful -20 degree weather in southern Ontario?
    For my car it takes 20-30 mins for the car to start blowing warm air. I'm talking warm for spring not warm for winter air. I don't have any leaks that I can find, so I think its weather related. Just need to confirm, thanks.

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    Sr Member Flagrum_3's Avatar
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    Default Re: 2015 3 GT Heater Core

    I get warm air within a few minutes, hot within 8-10min.

    What year is your car, you may need a thermostat.


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    Default Re: 2015 3 GT Heater Core

    2015

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    Default Re: 2015 3 GT Heater Core

    Check your temp gauge, it'll read lower then normal if your thermostat is gone.

    But first check your coolant level is up and proper mix.


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    Default Re: 2015 3 GT Heater Core

    Yeah, coolant level is at the full line. I checked it when I refilled the windshield washer tank. The car read only -17 when I left work at 4 pm. There is no temp gauge hanging outside of work though, so I don't have an accurate way to compare.

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    Default Re: 2015 3 GT Heater Core

    Quote Originally Posted by krash3 View Post
    Yeah, coolant level is at the full line. I checked it when I refilled the windshield washer tank. The car read only -17 when I left work at 4 pm. There is no temp gauge hanging outside of work though, so I don't have an accurate way to compare.
    I was talking about your engine temp gauge, but just remembered you may not have one in your model. :/


    If your heat doesn't build up in 20-30 minutes of driving, I would take it in and have her checked out, especially if your still under warranty. There's not many reasons for no heat or low heat. Ex; Heater core, thermostat or sensor. ...All should be covered under warranty.


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    Default Re: 2015 3 GT Heater Core

    if you have the defroster on, the A/C will be running... cooling the air some
    2005 Mazda3 SP23 hatchback (auto)
    2016 Mazda3 Sport GT (auto)

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    Default Re: 2015 3 GT Heater Core

    No, I don't run the AC in winter.

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    Default Re: 2015 3 GT Heater Core

    Quote Originally Posted by krash3 View Post
    No, I don't run the AC in winter.
    It runs its self when defrost is selected ,helps to dry the air to cut down on foggy windows, but it wont overpower the heat.

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    Default Re: 2015 3 GT Heater Core

    Mine does not because I only run the heater. Never seen the AC icon on while I have just the heater going in any of my cars.

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    Default Re: 2015 3 GT Heater Core

    Quote Originally Posted by krash3 View Post
    Mine does not because I only run the heater. Never seen the AC icon on while I have just the heater going in any of my cars.
    The AC light will not come on if you select any of the defrost modes, it explains so right in your manual.

    Its truly dumbfounding how many people will buy a car and not take the short time to read through their car manual.

    It would save alot of frustration....just saying.



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    Clifford (01-13-2018)

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    Default Re: 2015 3 GT Heater Core

    I did, but from what I read, I can choose to have the AC on auto or manual. In manual the AC is totally off. I never have it on auto.
    Besides, I posted this in regards to the original problem, the AC part went off topic.

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    Default Re: 2015 3 GT Heater Core

    Don't assume things about people. You know what assume spells.

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    Default Re: 2015 3 GT Heater Core

    how is it going off topic? You're saying your heater isn't blowing warm enough
    one of the possible answers is that the A/C is running, and it DOES run if you selected the defroster mode... it WILL turn on the A/C whether you pressed the button or not, and it will run regardless if the display indicator or light is on or not... it will also automatically force the air to "fresh air" mode from the outside... you have no choice in both of this when you select defroster mode... it is programmed into the car's electronics... the car (and many cars for more than 10 years, already) was designed this way and Flagrum was merely reminding you that this is clearly stated in the owner's manual

    with the A/C running, PLUS cold fresh outside air coming in, the heater air wouldn't be as warm as the incoming air to the heater core wouldn't be as warm
    if I don't run defroster mode, I turn off the A/C and run recirculated air mode, the heater at full blast gets hot enough to knock my socks off on my 2016... but if I run the A/C and fresh air mode, the heater isn't quite as warm

    you came here for help, we're all trying to help... it really would help if you slowed down to read and think about what people are saying before knee jerking to defence
    Last edited by TheMAN; 01-13-2018 at 07:02 PM.

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    Default Re: 2015 3 GT Heater Core

    You need to have the thermostat checked, sounds like it is not functioning correctly.

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    Default Re: 2015 3 GT Heater Core

    Quote Originally Posted by krash3 View Post
    I did, but from what I read, I can choose to have the AC on auto or manual. In manual the AC is totally off. I never have it on auto.
    Besides, I posted this in regards to the original problem, the AC part went off topic.
    @krash3
    I haven't read the 2015 manual since I own an '05, so I figured that the system would work the same and if you have read your manual, I apologize but maybe read it again on this particular issue. If you have your system off "Auto" and in manual mode, it should work the same as mine. Meaning if you select any defrost mode your AC turns on automatically and no indication is given that it is on. Except you may possibly hear the compressor switching on and off.

    Anyways, all that aside. Today I started my car cold and threw it on one of the defrost modes (Windshield/Floor), just to compare, and with heat dial turned high. Within 8 minutes tops I had hot air coming through. So again as I mentioned much earlier I think you have a possible thermostat related issue, as its unlikely your heater core would be an issue so early.

    So my suggestion is to take it in to the dealer and have it checked out. Especially if your still under warranty, without hesitation.


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    Last edited by Flagrum_3; 01-14-2018 at 01:21 AM.

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