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"Bangs" and "Clunks" when charging?
- Thread starter Surfer
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- bang sounds at suc
The noise itself certainly doesn't come from a chemical reaction, unless you're referring to just the heat generation from the chemical reaction. As mentioned farther upstream in this thread, the noise is from a piece of sheet metal expanding or contracting from changes in temperature or air pressure, and the flex/curve shape finally pops to be curved in the other direction. It is sometimes referred to as "oil canning", since some people are familiar with metal cans of oil or gasoline that are sealed and will make this same metallic pop sound if they heat up or cool down a lot.
Robipad
Member
Here a very clear example from Björn Nyland of what happens with high power charging. Clearly an example of a metal case that expands and suddenly bends. I've heard it many times during SUC charging with my Model 3.
webbah
Active Member
There’s a TSB to replace the battery breather valves to resolve this. Mines going in next week to fix this.
webbah
Active Member
Funny how we assume things are normal after hearing them over and over. But again, there is a TSB to resolve this with new breather valves. I personally will have mine fixed.
AlanSubie4Life
Efficiency Obsessed Member
The second video here is the contactors engaging. There is a separate sound for them releasing. Unrelated to the noises when Supercharging.
If you're talking about the 'clunk clunk' noise that happens a few seconds after opening a door, that's the high voltage contractors powering up the car. This is by design and won't go away. The "bang" noise can be MUCH louder, and is not intended to happen. Its supposedly caused by a pressure imbalance inside the battery that causes expansion/contraction of the metal that causes the bang sound. This is more likely to happen when its cold outside and the battery is generating heat from being supercharged.
Do you have details on that TSB? Mine can be pretty noisy when charging in very cold temps so perhaps I might have it looked at.
Robipad
Member
webbah
Active Member
I don’t have the exact TSB number to be honest, but once I heard about it I booked a service center appointment in the app. They confirmed the appointment so all good.
webbah
Active Member
srs5694
Active Member
The TSB makes it sound like the issue doesn't affect reliability or safety. Is there any reason to think that Tesla is downplaying the seriousness of the issue? If so, I'll probably get mine fixed; but if it really isn't a concern for anything but the annoyance of hearing the sounds, I don't think I will, since I'm rarely in my car when I Supercharge it, so it really doesn't bother me. (I can't even be 100% certain that my car is affected, in fact, although given that it's six months old, I assume it is.)
webbah
Active Member
The sound is from releasing excess pressure via breather valves. I personally think it’s more than just the sound to be concerned about (this does not happen in Model S or X) and worth the time to do the fix to me.
Robipad
Member
It is probably not an very serious issue but at the same time Tesla has reasons enough not to overload an already much to small service organisation with less serious issues. The sound itself is not a problem but material fatigue may become an issue in the long run. See the probably cause this video:
Wow. I just was sitting in my car during a 20% to 75% supercharging session and holy cow those thumps scared the crap out of me. They’re not the “subtle” ones when waking the car from sleep or anything, these are full on metallic BANGS.
Does anyone know how long the change takes and if a mobile ranger can do it? I’ll be at a service center in a couple hours to pick up some TPMS but I didn’t have them schedule an actual appointment since nothing needed done with the car... however I might try to push they do this service bulletin if it’s 15 to 20 minutes worth of work since I’m 3+ hours away from a service center...
Does anyone know how long the change takes and if a mobile ranger can do it? I’ll be at a service center in a couple hours to pick up some TPMS but I didn’t have them schedule an actual appointment since nothing needed done with the car... however I might try to push they do this service bulletin if it’s 15 to 20 minutes worth of work since I’m 3+ hours away from a service center...
