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

Headlights make noise?? Coolant loop for the LEDs?

Discussion in 'Model 3' started by ratsbew, Jul 18, 2018.

  1. ratsbew

    ratsbew Member

    Joined:
    Mar 3, 2012
    Messages:
    717
    I was messing around with the headlights in my garage today. I turned them on manually and noticed a distinct and obvious noise when I turned them on. The noise quit immediately when I turned the lights off.

    All I can figure is that there is a glycol coolant loop that keeps the LED chips cool and the noise is a small circulating pump. Does that sound right? This car is full of surprises!
     
    • Informative x 1
  2. Robert831

    Robert831 Member

    Joined:
    Jul 22, 2017
    Messages:
    99
    Location:
    Watsonville, CA
    This made me think of the old joke about blinker fluid. It's possible you're hearing a DC power converter. They can make little squealing noises. I don't have my M3 yet so I can't confirm. (Yes, I called it M3 because this is not a BMW forum.)
     
  3. JeffK

    JeffK Well-Known Member

    Joined:
    Apr 27, 2016
    Messages:
    6,362
    Location:
    Indianapolis
    The aftermarket LED lights I have on my ICE, have fans in the back to cool the heatsinks.
     
  4. eli_

    eli_ Member

    Joined:
    May 14, 2018
    Messages:
    66
    Location:
    Bellevue, WA
    Could be coil whine from PWM on the power to the LEDs.
     
    • Informative x 1
    • Like x 1
  5. boaterva

    boaterva Supporting Member

    Joined:
    Apr 2, 2016
    Messages:
    5,385
    Location:
    Northern Virginia, USA
    I think we’ve seen removed headlight assemblies on various videos (like Rich Rebuilds and others) and not a mention of coolant. For those that can hear it, probably transformers, and the like.
     
  6. fr100

    fr100 Member

    Joined:
    Dec 27, 2017
    Messages:
    163
    Location:
    Northern CA
    Lights that need liquid cooling would be terrible design. I'm going to go with coil whine.
     
  7. ratsbew

    ratsbew Member

    Joined:
    Mar 3, 2012
    Messages:
    717
    I listened more carefully and it sounds like fans (more than one). No idea if they are fans directly behind each light or if it is for a DC converter as some have mentioned.
     
    • Informative x 2

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