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2021 Model 3 Heater blowing cold air

Discussion in 'Model 3' started by aardsoft, Jan 8, 2021.

  1. Cybr.Myk

    Cybr.Myk Member

    Joined:
    Aug 30, 2020
    Messages:
    101
    Location:
    Saskatoon
    Wow! Where are you?
     
  2. Acxxu

    Acxxu Member

    Joined:
    Jan 1, 2021
    Messages:
    6
    Location:
    Helsinki, Finland
    :) I'm in the Kittilä and Kolari region in Finland. There'd probably be a Tesla Service Center closer by in Sweden or Norway, but we're not supposed to travel there due to the COVID-19 situation.

    Update:
    I've managed to get the heating working, but am still trying to figure out how I exactly did it. As for the background: Today has been between -24'C...-26'C degrees outside since the morning, so I don't think the temperature change itself was the reason as I've experienced the problem throughout the day and I had it also working yesterday in a much harsher temp.

    After all the debugging (and still being unable to turn on heating from the mobile app itself), what I did was simply opened the car with the key card, sat in and fiddled with the aircon settings, turning them from Auto to Manual and increased/decreased fan speed, had backseat fan setting on, etc. basically toyed around with it. I also reversed the car a car's length.

    What happened first was that I could see the car consuming above 3kW of battery power (SMT) with the heater on "HI" and "window heating icon" on - it now and then pushed a little bit of warmth into the cabin, turned it back to Auto. But with this method I only got the cabin to heat up to ca. +10'C according to the mobile app. Obviously this was a delight, but not exactly "family friendly" yet.

    Next, I removed my phone of being a key for the Tesla from the Locks menu and hopped out of car, locked it with the keycard. Next went inside my cabin and used the Tesla Mobile App to "Turn on climate" and voila, it worked. Set at "HI" and it almost instantly lighted up the red "window heating" and "battery heating" icons in the Climate -view. Cabin warmed to +25'C in less than 10 minutes.

    Further testing: I turned it off, cabin temp dropped to +9'C in some minutes (well, it's cold outside, no wonder). Turned it back on from the mobile app successfully and have now had it heating to +24'C, which the car reached. The car seems to turn off and back on the "battery heating" (icon) every now and then, supposedly turning back on when the cabin heat starts to dwindle or reduce too much.

    Will have to see what happens after heating the cabin and going for a drive, if the car can upkeep comfortable inside temperatures/warmth.

    A software bug? Can't tell yet, but it smells a bit like one, maybe combined with a sensor fault?
     
    • Informative x 2
  3. Acxxu

    Acxxu Member

    Joined:
    Jan 1, 2021
    Messages:
    6
    Location:
    Helsinki, Finland
    Update:
    I haven't had the issue of not being able to adjust climate from the mobile application replicate as of since. Not sure what "reset" the situation from the mobile application point of view, maybe it was a hard reset or maybe it was the removing phone from being a key; but I no longer have seen the "Failed to turn on climate" in there, nor a "Climate keeper unavailable due to system fault" in the car.

    This isn't a full recovery though, I did the drive to Tesla Service Center (ca. 1,000 kilometers / 620 miles away) and found out the following during the drive - I had a lot of time to play with this :)

    1. Car heating works OK when you set climate from the mobile app AND the red "battery icon" appears alongside the red windshield icon. This is a good solution for stationary warm-up before drive.

    2. Car heating works OK when it detects that the supercharger is ca. 40 kilometers away (or less) as it starts the "Preconditioning battery" -cycle while driving.

    3. Car heating works OK while you're connected to a SC or another charger (e.g. we have so called Hyperchargers around here from other brands).

    4. Car heating doesn't work during the drive (unless it's the case of I described at #2 above). At times I could get it to push a little bit of warm air from the air vents; I did a cycle auto to manual to auto of setting heat and also fiddled heat options through the mobile application in the middle to have this happen. End result seemed to be that with +27.5'C (one down from 'HI'), you could get heat either to the back or also to both, back and front. But this wasn't enough to really warm up the cabin.

    Seat heaters worked marvelously during the whole time.

    Tesla Service Center's pre-assessment before maintenance was that they were prepared to do the following, part numbers included:

    Correction: Sensor - Subcool - Pressure and Temperature - High Pressure (Remove & Replace)

    Parts Replaced or Added Part QTY.
    PT SENSOR, LOW PRESSURE(1510048-00-B) 1 piece
    PT SENSOR, HIGH PRESSURE(1510047-00-B) 2 pieces


    Hope this gives some insight to people who may experience the same issue :)
     
  4. LeffeP

    LeffeP Member

    Joined:
    Dec 23, 2015
    Messages:
    13
    Location:
    Sweden
    Same components was changed on my car after fully loosing all heat. Haven't had problem other than a total loss of heat. Picked it up yesterday so haven't tested the car that much, but today in zero degrees C heat works perfect again. Heating through the app also. Seems like these components get swapped on all car with heating problems so dont accept Tesla saying its not a problem, took me a lot of discussion to even get them to admit it really is...
     

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