If you watched this video, you learn that it was apparently a cracked plastic coolant inlet nozzle into the battery pack from foreign road debris. Tesla refused to open it up or repair it, presenting the only solution was to have a brand new $16,000 battery pack...on a practically brand new car.
Rich Benoit & his 3rd party repair shop Electrified Garage filed off the cracked plastic nozzle, thread tapped the inlet, use a brass threaded nozzle with a similar plastic inlet with thread seal tape, and fixed it for $700.
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