A Tesla Model Y engineer, who suggested the heat pump’s inclusion, has left the company after ten years, his LinkedIn account said.
Joseph Mardall served as the Engineering Director for Tesla from April 2018 to January 2021 but has held several other roles with the electric automaker since joining the company in February 2011 as a Senior Thermal Engineer.
Arguably, Mardall’s largest accomplishment while working with Tesla was the groundbreaking Model Y heat pump, a system that was included in the all-electric crossover to handle cold temperatures and combat range loss due to winter climates. Mardall led three teams with 60 or more engineers responsible for developing new HVAC systems that would be compatible with electric vehicles. One solution was the heat pump, an idea that came from Mardall’s engineering teams and has been a big hit with proven success in the Model Y.
CEO Elon Musk even told Teslarati in March 2020 that the heat pump was “some of the best engineering I’ve seen in a while. Team did next-level work.”
Model Y heat pump is some of the best engineering I’ve seen in a while. Team did next-level work.
— Elon Musk (@elonmusk) March 23, 2020
Mardall is headed to Zipline as the Head of Engineering. He will be working with a team of engineers “to design and build the next generation of autonomous drones to provide every human on Earth with instant access to vital medical supplies,” his LinkedIn account says. He states that the highlights of his career at Tesla “included the ground breaking Model Y Heat Pump system and leading Tesla’s efforts to develop a ventilator.”
“After 10 wonderful years at Tesla, I’m super excited to start my next chapter as Head of Engineering at Zipline, working with a team of talented and committed engineers to provide every human on Earth with instant access to vital medical supplies. The next 5 years are going to change everything, and I can’t wait! We are hiring for all roles across engineering and I would love to hear from you – come fly with me!”
Interestingly, Mardall has some medical equipment development experience, even though his work before Tesla was at McLaren Racing. Mardall worked intensively on the Tesla ventilator developed by company engineers last year. As the COVID-19 pandemic raged on, Tesla was donating third-party ventilators to hospitals in need but decided to develop its own. The ventilator prototype that Tesla built was comprised completely of parts from the Model 3 sedan, including the dash screen to see measurements of patient vitals. Mardall was present in Tesla’s video of the ventilator, posted in April 2020.
Mardall is seen here explaining the Tesla Ventilator, which was never released by the automaker. (Credit: Tesla)
It is unclear who Tesla will place in the Engineering Director Role currently. Mardall’s work at Tesla was innovative and crucial, and many Model Y (and Model 3 Refresh) owners will thank him every day for the duration of their ownership!
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Tesla Model Y L has two distinct features for luxurious comfort
This is not to say the other interior additions are not factors in the Model Y becoming a more luxurious and premium vehicle, but the two mentioned in this article are particularly pertinent in that conversation.

Tesla’s new Model Y L has two distinct features that are geared toward giving occupants a taste of luxury with guaranteed comfort.
These two features should definitely be part of the company’s future lineup, and they could prove to be massive upgrades to the Model Y’s interior, which is certainly premium but is missing some things that truly tailor to a “luxury” feel of an automobile.
This is not to say the other interior additions are not factors in the Model Y becoming a more luxurious and premium vehicle, but the two mentioned in this article are particularly pertinent in that conversation.
Tesla Model Y L might not come to the U.S., and it’s a missed opportunity
Power-Adjustable Thigh Supports
In the front seats of the Model Y L, there are power-adjustable thigh supports that will enable some additional comfort on the legs:
The Tesla Model Y L features power-adjustable thigh supports for the front seats pic.twitter.com/1tBQG0KznK
— The Tesla Newswire (@TeslaNewswire) August 19, 2025
Most might think that these thigh supports are simply a feature that makes the ride more comfortable, which is true. However, they have benefits for the ride and after you exit the car.
Providing proper lift on the legs and thighs can be beneficial for people with back problems or posture issues. The lower back takes an increased amount of stress during long car rides, especially as the legs are fixed in the chosen seating position.
Tesla Model Y L officially launched: price, features, and more
Adding some support to the thighs can help reduce pressure on the lower back and hips, and distribute weight more evenly, taking stress off pressure points.
It can also contribute to better spinal alignment. They also have safety benefits, as some riders could have an improved seatbelt position thanks to the thighs being in this position.
Second-Row Mechanical Armrest
Tesla also added mechanical, one-touch armrests to the Model Y L’s second row, a nice and premium touch for the riders in the middle of the vehicle:
The Model Y’s second-row armrests are pretty satisfying to watch.
They’re touch operated, so they should be very convenient to use.pic.twitter.com/iGlGiJXGNR
— TESLARATI (@Teslarati) August 19, 2025
Add the additional space the Model Y L provides to riders, and it already gets more comfortable. However, the addition of the mechanical armrests gives a good option of comfort for those who are seated in the second row.
They can also be retracted with the touch of a button, allowing for those in the third row to exit the vehicle easily.
One con to the mechanical portion of these armrests is that it is another moving part, and, of course, that puts it at risk of having issues.
However, it is certainly more premium than a manual armrest, and the flashy carbuyers will appreciate this small but mighty addition.
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Tesla’s NHTSA probe is already on its way to being resolved
The problem the NHTSA had with Tesla’s reporting is already on its way to being resolved, as the agency and the company have been in communication.

Tesla is being probed by the National Highway Traffic Safety Administration (NHTSA) for not reporting accidents in a timely manner, the agency said on Thursday.
It is already well on its way to being resolved, the agency said.
The agency’s Office of Defects Investigation (ODI) identified numerous instances in which Tesla reported crashes that “occurred several months or more before the dates of the reports.”
The Standing General Order in place by the agency requires crash reports to be submitted within five days of Tesla receiving the notice of an accident.
The investigation states Tesla submitted crashes in one of two ways:
“Many of the reports were submitted as part of a single batch, while others were submitted on a rolling basis.”
The problem the NHTSA had with Tesla’s reporting is already on its way to being resolved, as the agency and the company have been in communication.
Tesla has already been in contact with the agency’s ODI and stated that the timing of the reports was an issue with its data collection. The issue has been resolved, Tesla told them.
The NHTSA said the initiation of the probe against Tesla is a “standard process for reviewing compliance with legal requirements, to evaluate the cause of potential delays in reporting, the scope of any such delays, and the mitigations that Tesla has developed to address them.”
It is the latest NHTSA probe into Tesla, as it has also been investigating the company for accidents during Full Self-Driving operation in reduced visibility conditions.
The agency also sought information on the rollout of Robotaxi a few months ago, and how Tesla planned to handle low-visibility conditions in its driverless ride-hailing service.
The NHTSA was interested in knowing how Tesla planned to assess the ability of FSD’s engineering controls, whether any other similar FSD crashes had occurred in low visibility, and if modifications to FSD software would impact its performance in these conditions.
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Tesla rolls out minor but significant improvement to Robotaxi service
As per Tesla, Robotaxis will now arrive at their pickup locations with their doors locked.

Tesla has rolled out a minor but significant improvement to its Robotaxi service. The update was shared by the Tesla community on social media platforms such as X.
New Robotaxi App update
As observed by the electric vehicle community on social media, Tesla has started rolling out the Robotaxi App’s Version 25.8.5 (6074) to users. The update seems to be quite minor, though Tesla mentioned something quite notable the update’s “What to Test” section.
As per Tesla, Robotaxis will now arrive at their pickup locations with their doors locked. Customers would not need to unlock the Robotaxis manually, however, as the vehicles would automatically unlock as they approach the car. “You ride now arrives locked and will automatically unlock as you walk up. Just ensure your app has Bluetooth access enabled,” Tesla wrote.
While this update is minor, it does improve the safety of the vehicles themselves. It also provides another layer of convenience for users of the driverless ride-hailing service. The fact that Tesla is already refining the Robotaxi App’s features this early bodes well for the program. It suggests, if any, that the service will already be fairly refined when it starts being opened to more users.
Robotaxi praised for its safety
Tesla is following a deliberate and cautious rollout strategy for its Robotaxi rollout, though early reviews of the system have been quite positive. Some reviewers have also dubbed Tesla’s Robotaxi service as a safer alternative to more conventional ride-hailing services such as Uber.
This was highlighted by auto reviewer Scotty Reiss in a post on A Girl’s Guide to Cars.
“I like the personal safety factor. No driver to threaten or harass you. You control the locking and unlocking of the car. You can change the pickup location at any time. The car will wait for you. You can call the support desk if you need help. You can change your destination if the drop-off area seems sketchy. All of it together makes me feel safer getting a car home from the airport at midnight or into the city after dark, and I definitely feel safer having my daughters take a self-driving rideshare when they go out to meet friends for dinner,” Reiss wrote in her post.
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