TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker and becoming a Supporting Member. For more info: Support TMC

Heater On Indicator

Discussion in 'Model S' started by SDRick, Feb 12, 2019 at 11:28 AM.

  1. SDRick

    SDRick Member

    Joined:
    Jun 25, 2015
    Messages:
    955
    Location:
    SD CA United States
    Is there any way to tell if the heater (or air conditioner) is actually on and using power. Often, the ambient outside air temperature is sufficient to heat or cool the cabin with fan only without using additional battery to do so.

    It may be a silly question but how does one tell?
     
  2. Big Earl

    Big Earl Supporting Member

    Joined:
    Jul 12, 2017
    Messages:
    1,780
    Location:
    Springfield, VA
    There is no real way to tell. HVAC consumption will show up on the car's power meter in the instrument cluster while the vehicle is stationary, but sometimes the consumption is low enough that it doesn't show up.
     
  3. MorrisonHiker

    MorrisonHiker S 100D 2018.50.6

    Joined:
    Mar 8, 2015
    Messages:
    5,751
    Location:
    Colorado
    It's hard to tell but the temperature will be a lighter color when the HVAC is powered on and a darker color when it is off.
     
  4. SDRick

    SDRick Member

    Joined:
    Jun 25, 2015
    Messages:
    955
    Location:
    SD CA United States
    Where is the color changing and can you tell if it's the heater that's on or the AC?
     
  5. Tam

    Tam Active Member

    Joined:
    Nov 25, 2012
    Messages:
    4,593
    Location:
    Visalia, CA
    If it's 32F outdoor and the cabin is 100F under the sun, I can turn off the A/C and turn only the fan on to bring the temperature down (or roll down the window).

    That's how I know it's off and not on.

    However, there's no button to turn off heater. I can adjust the temperature setting and the heater would automatically on or off based on the setting but there's no indicated lights for me to tell whether the heater is on or off.
     
  6. MorrisonHiker

    MorrisonHiker S 100D 2018.50.6

    Joined:
    Mar 8, 2015
    Messages:
    5,751
    Location:
    Colorado
    The temperature at the bottom of the center screen. You can hold it in to turn it on or off and see it changes color slightly. It's not very noticeable. You can't tell if it is the AC or heat that is on.

    If you tap it to bring up the HVAC controls you can see a power button and turn things on or off there as well. Not the best interface
     
  7. Snowstorm

    Snowstorm Active Member

    Joined:
    Dec 8, 2016
    Messages:
    1,083
    Location:
    Ontario Canada
    I don’t think the OP is asking to know if the HCAC system is on or off, that one can tell with the darkness of the temp setting number (dark means off). The OP is asking if he can tell when the heater or AC compressed is running or just the fan.
     
  8. nativespinner

    nativespinner Member

    Joined:
    May 28, 2018
    Messages:
    8
    Location:
    Tulsa, OK
    No easy way to tell. You can turn it off by dropping the temp all the way down. I do this if I want some fresh air without using heat if it's 40-60 degrees outside.
     

Share This Page

  • About Us

    Formed in 2006, Tesla Motors Club (TMC) was the first independent online Tesla community. Today it remains the largest and most dynamic community of Tesla enthusiasts. Learn more.
  • Do you value your experience at TMC? Consider becoming a Supporting Member of Tesla Motors Club. As a thank you for your contribution, you'll get nearly no ads in the Community and Groups sections. Additional perks are available depending on the level of contribution. Please visit the Account Upgrades page for more details.


    SUPPORT TMC