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Why is the fan turning on so often when parked/charging?

Discussion in 'Model S' started by timvracer, Oct 1, 2017.

  1. timvracer

    timvracer Member

    Mar 5, 2017
    Los Gatos, CA
    I have noticed that often, when I go into the garage, my car is making noise as if the climate control is on. Any idea on what this is (sounds like the fan) and why it is going on so often?

    I have had unusually large electric bills (I stay plugged in all night) despite not driving alot of miles, but I do charge to 90% every night. I am starting to wonder if something is wrong, and the car is using excessive power for this fan, whatever it is.

    I have found once in awhile that when I login with the app, climate control is ON although I never set it to be on with the app. If I park with the Climate Control on, does it stay on even after leaving the car??
  2. gg_got_a_tesla

    gg_got_a_tesla Model S: VIN 65513, Model 3: VIN 1913

    Jan 29, 2010
    Redwood Shores, CA
    It could be the "Smart Preconditioning" which attempts to learn when you typically drive the car and precools/prewarms the car ahead of that time.

    I had long turned this off as I didn't find it
    • Like x 1
  3. oktane

    oktane Active Member

    Oct 25, 2016
    Not sure why they don’t allow a built-in schedule function and you have to use a third-party app.
    • Like x 1
  4. Jason S

    Jason S Model S Sig Perf (P85)

    Apr 20, 2012
    Rocklin, CA
    A) Smart Preconditioning
    B) The feature that keeps the car at 105F so any kids left in the car don't overheat -- I found this turned on by default, had to turn it off.
    C) A key has been left in the car?
    D) Glitch that has the default set to leave AC on. Rebooting the center screen or toggling the AC in the app might fix that.
    • Helpful x 1
  5. CHG-ON

    CHG-ON Still in love after all these miles

    Jun 24, 2014
    Santa Cruz Mountains, USA
    It's common for the fan to run when ambient temps are high and/or charging. It needs to cool the batteries.
    Keeping the car at 105. That's overheat protection. I would doubt your garage is that hot a night, or ever, based on where you live.
    Kill Smart preconditioning. It's useless and could be the culprit. in 3 years, I have never had my AC running all on it's own with the car locked and shut down with that off.
    Make sure to check out PGE's EV rate plan. If you charge at night, it will save you a fortune. My kw rate is 0.11 and I am just over the hill from you. I pay, on average approx 0.035-.05 per mile for energy.
  6. chillaban

    chillaban Active Member

    May 5, 2016
    Bay Area
    As others have said, the fan and AC compressor can come on to cool the battery, even for L2 charging.
  7. davinci2017

    davinci2017 Member

    Feb 3, 2017
    Milpitas, CA, USA
    If you dont close all the doors properly the CC system keeps running.
    If you leave smart pre-conditioning on, it does it once in a while
    If you have the new "leave AC on" mode turned on, then yes it will keep running (but I think that resets itself everytime)
  8. G'sinHawaii

    G'sinHawaii Member

    Nov 24, 2014
    cooling of any number of equipment and components in Electric cars...., its normal.... the list is long... related to computers and charging

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