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S100D Air Conditioner Cuts out on Humid Days?

Discussion in 'Model S' started by andrewortman, Jul 15, 2018.

  1. andrewortman

    andrewortman Member

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    Location:
    Austin
    Hi!

    I had my Model S since November now and it runs great! I am experiencing an interesting problem though - on hot (esp humid) days, the air conditioner will stop pumping cool air for about 1-2 minutes in the cabin. This causes the temperature to spike very quickly. I even have this plotted on TeslaFi (see the dark red line)

    Untitled.png

    At approx 11:47 am today, I jumped on a freeway onramp and roughly at the same time the air conditioner stopped blowing cold air. I bumped the temperature from 68 down to LO in hopes that would fix it, however, nothing changes and the car gets warmer for another minute or so to a peak temperature of 84 degrees. After about 90s, the air conditioner abruptly turns back on and the car is cool again. The fan runs the entire time, just the temperature of the air is different. The air seems to be being pumped directly from the outside - it is noticeably more humid and warm compared to air that would otherwise be air-conditioned.

    This seems to happen only on hot days, and only whenever I accelerate hard the first time of the drive. I'm not getting any error codes and service said this was normal when they looked at my logs (which is beyond me as to how this is acceptable in any car, let alone a higher-end car like the Model S) Service claimed that if the air conditioner is not set to LO it may do this to warm the car back up to the expected temperature, but with my temperature being 68 and the actual temperature being above that, I'm not sure why it would consider doing that, especially if it just cools back down to the original temperature shortly after. I also debunked this theory by setting my car to LO and then accelerating hard - the car still does the same thing.

    Has anyone experienced this before? Is this normal? I'm not sure if I should accept this as a normal known issue or if this is something that is repairable. If it is repairable, I will need to go back to service to insist they look at it (which is something I absolute hate doing :p)

    Cheers!
    Andrew
     
    • Like x 1
  2. Ande

    Ande Member

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    Location:
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    I do not know this for sure, as we don't have very high relative humidity in northern Norway, but any high power AC in general, can need a deicing period , to prevent condensed water to build up as ice on the evaporator.
     
    • Informative x 1
  3. animorph

    animorph Member

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    I think we had our A/C ice up a week ago on a long trip. It was out for maybe an hour, slightly cool air and low airflow. Worked again after the next Supercharger. Turning it off for a while would probably work best to de-ice if it's not doing it itself. Haven't had this problem before, and have never seen so many complaints on TMC, so maybe something a fairly recent firmware update screwed up.
     
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  4. AmpedRealtor

    AmpedRealtor Well-Known Member

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    Your radiator louvers are probably stuck in the closed position. Very common problem that causes reduced AC performance. Have service run a thermal stress test, it should reveal any issues.
     
  5. tljdesign

    tljdesign Member

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    Having a similar issue and Tesla is replacing one of the actuators controlling some of the vents.
     
    • Informative x 1
  6. MikeBur

    MikeBur ManualPilot

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    #6 MikeBur, Jul 15, 2018
    Last edited: Jul 15, 2018
    Definitely check that louvers are opening properly, and report the issue.

    Battery cooling has priority over AC output. Strong demands of battery in extreme heat conditions can cause short periods where coolant flow is minimized for cabin. Should be for minutes, max, though I thought.

    There might be a change in the algorithm that reduced max battery temp, as hot batteries have significantly shorter lifespan.

    Edit: just looked at TeslaFi graph posted. 90 outside VS 74 inside at 70 mph... that shouldn’t be an issue to manage. Get it checked

    Here’s a TeslaFi log from mine from yesterday... just fine. FW: 2018.26 3bbd9fd
    887F28D7-3F8A-4C1E-A16F-31B85DE445AA.jpeg
     
    • Informative x 1
  7. andrewortman

    andrewortman Member

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    OK Great! Thanks all - I will have Tesla take a look at it next week then!
     
  8. MisterTwo

    MisterTwo Member

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    I have the exact same issue on my Sep 2017 S75D, Tesla downloaded the logs and told me it was a known issues. They have a new part (sorry no more details) that fixes the cutouts but it’s backordered.
     
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  9. Unpilot

    Unpilot Active Member

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    I have a 2017 S100D driving in hot and humid days here in the Midwest have had no issues.
    Some days we have reached a "feel like" temp of 107.
     
  10. jewilson2

    jewilson2 Member

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    I've only had mine for 2 weeks, but I've noticed the same. Question for you....do you have "Range Mode" set to ON?
     
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  11. MisterTwo

    MisterTwo Member

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    No, range mode is off. To address one of the comments above, this isn’t the same loss of A/C cooling capacity associated with cooling the battery. This issue is a conplete loss of all cabin cooling for approx 3 min.
     
    • Informative x 1
  12. morrisdl

    morrisdl Member

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    Thanks for the info...add me to the list. Happened twice in last 14K miles. Will check the louvers and teslafi logs next time (if) it happens again.
     
  13. jeffdom1978

    jeffdom1978 Member

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    Yep, this happened to my 1 month old 75d twice, Lost all cabin cooling for 2 mins and then started again, again on very hot day 90+
     
  14. OpenThirdEye

    OpenThirdEye Member

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    Fishers, IN
    Interesting. Brought my 100D into the SC a few weeks ago for this very same issue and was told it would just require a software update that wasn't out yet. Looks like I need to get another appointment at the SC since this is still happening to me and see what the answer is this time.
     
    • Informative x 1
  15. Snowstorm

    Snowstorm Member

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    Canadian S100D June 2017

    I had this happen in a hot and humid day in 2017. No cold air was blowing out of the AC for 30 minutes, slow stop and go traffic on a hot and humid day. Decreasing the temp to LO and or increasing fan did nothing, still hot and humid air from vents.

    Problem went away after 30 minutes and it blew cold air again. Never seen it again so far.

    Maybe the evaporator iced up?
     
  16. Pinot.Noir

    Pinot.Noir Member

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    We gave had numerous issues with the AC on our current roadtrip [CA to CO). The service center could not find any issues before we departed, but the issue crops up every 800 miles or so.

    I hit the "reset auto settings" and that worked a couple times. Clicking on outside air and then back to recirculating seemed to fix it a few times as well. Will definitely be going back to a service center if it fails on the next leg of our trip from CO to Los Angeles.
     
  17. David99

    David99 Active Member

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    I know exactly what you are seeing. Had this happen to me as well.

    I have been driving a lot in very hot weather recently. Sometimes very extreme heat. Up to 116 F. I noticed these moments of the AC seeming to cut out sometimes. It not actually cutting out. It is just shifting things around! At these extreme temperatures the AC keeps the air on recirculating. This is much more efficient. Every once in a while it has to let fresh air in and then it suddenly has to cool the hot outside air down to cabin temperature. The AC usually can't do that fully when it is very hot outside and for a few minutes it feels like the AC isn't working properly. Once it switches back to recirculating, the air is feeling much cooler again.

    Another issue is that driving at very high temperatures, sometimes the battery gets very hot and the car uses the AC system to cool it. That takes up some of the cooling from the cabin away. Sometimes the car even shows a message that AC power is reduced due to battery system cooling.

    I have had both happen to me several times over the past 6k miles.
     
    • Informative x 1
  18. Mobius484

    Mobius484 Member

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    This makes sense to me. As to what I’ve been seeing lately...
     
  19. Snowstorm

    Snowstorm Member

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    When the AC cut out for me, I was definitely not driving at high speeds. Stuck in local Toronto city traffic. 10-30kmph
     
  20. zoeconner

    zoeconner Member

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    If the car battery gets too hot the car will choose to cool the battery first before you.
     
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