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Cabin drafty?

I've had the car for 10 days now in n.j. Pretty cold up here now, and I'm finding that although the cabin heats up quickly, after driving for a while it gets cool and drafty. I've played with the climate settings (mostly on auto), and it's better, but not gone. Would like to hear what others from cold climes are experiencing.

Have you tried switching to recirculated air instead of exterior air?

I don't find it drafty. I do notice a lot of fogging on the driver's side windshield.

I've noticed both... draftiness and fogging on the driver's side windshield. It doesn't seem to be consistent, however. It's almost as if there is cold air coming in somewhere, or the vents are letting in cold air, but I can't seem to pinpoint it. Other times, it is perfectly warm and blowing warm air. I haven't been able to determine a pattern yet.

Also had fogging issues the first few days I had the car. When I changed the climate settings to include the windshield area (one of 3 areas you can select), have not had an issue since.

Might wanna check the door seals around the glass. My 'Stang has a similar no frame door, and if its not lined up right you can get leaks there; both air and water depending on how bad the seal is.

Also check the 'window drop' to see if its working right ( how the window goes down a little when the door is opened, and how it rolls up after the door latches).

Good suggestions Vawlkus, thanks!

Take it into the service shop. Someone in the Bay Area took his in and was told he had soft seals. Might be able to get them replaced if it turns out to be the same scenario.

My Signature performance if parked in the heated garage overnight the windows fog enough to require using the defoggers intermittently for the first 20 or so miles. However if left outside over-night no fogging. The weather here has been below freezing most nights and into some days. Using recirculating air to heat, I feel a strong cold draft coming forward under the driver's seat. Even with the cabin temp set quite high. The draft causes my feet to freeze. I'm going to try putting a bed pillow under the driver's seat the next time I have a cross country drive and see if that helps.

Same here in Montreal. It heats up fast but after a while the cabin gets cold. There is actually cold air coming out so I have to adjust the climate manually. I suspect a software problem. Hopefully will be addressd in 4.2...

I am experiencing exact same issue. Heats up very quickly, then starts blowing cold air for some reason, then back to hot again. Service appt pending in Menlo Park to look at this, but I agree, mught just be a software issue.

I didn't notice this issue when it was cold, but yesterday I turned off climate control because it felt like the AC was on (or at least it was blowing outside air in) when the temperature was set on 72 and the outside air temperature was 64. It didn't feel above 72 degrees (it could have been I guess) -- but it definitely was going to make the car uncomfortably cool. It did this after I had been driving for 45min or so.

I wonder if the sensor location is someplace where it gets warm and throws off the HVAC?

drove from philly to NYC and back yesterday, car drove awesome of course but I did not yet figure out the climate controls it seems and my feet did get cold during the trip as did the passenger in the back.
coming back after charging at a charge point location, the car was perfect temp upon starting but went back to the same cold climate during the 2 hour trip back.

I too have experienced the "drafty cabin" syndrome. Of course, it's been abnormally cold here in Southern California, going down to freezing at night. I like the heated seats, but I find that during a long drive, unless you have the heat turned up to almost 80, the cabin just doesn't get warm.

When summer comes around and the temps climb above 100, I'll consider this "flaw" a "feature" and
experience a cool, breezy cabin.

I'll be interested to hear what Service has to say, for any of you who have taken it in to have it looked at. I haven't brought it to the attention of my service center yet.

Update for the vent temperature issue:

I took my S into the Menlo Park service center today for the vent issue. They hooked up a diagnostic laptop to the car to test it out. While there have been rare, isolated reports of failing heating units or sensors, neither was the case in my car, which apparently is operating as it should.

Explanation: If you have the Climate control on Auto, it will use the floor vents to send warm air into the car, but NOT the front vents. This is by design, the reason being that heat from front vents is a safety concern (re: makes you 'sleepy') that other car companies have also implemented. In Auto mode, it will use the floor vents to heat the cabin, and you should not experience warm/cold switches from the front vents. Remains to be seen if I will get warm/cold switches from the floor vents. I am guessing that I will.

If you override the Auto and increase the fan speed manually, and activate the front vents manually, the air from the front vents will warm up initially (depending on the temp you have chosen), but the sensors are measuring the temperature of the air in the vents, not in the cabin. The temperature of the vented air will first overshoot the temperature you selected, then become cold and undershoot, and eventually approach the goal temperature. But this fluctuation typically prompts a reaction from the driver and passengers, such that we then change the setting again to a higher temp to start the process all over again.

If we leave things in Auto, I was told that this won't happen nearly as frequently and temperature will be achieved more smoothly. This remains to be tested, but I will update you once I try it tonight.

Side note: There were ~40 people (including some Japanese tourists as well) clamoring to see the show room cars in the store today. For those who have been there, the MP location is not ideal for foot traffic at all. It was shocking to see that volume of interest. Very cool.

I am experiencing the same behavior as described above, its heats up quickly then starts sending out cold air and with the outside temperature below 20 this should not be happening. sometimes I then pump up the temperature control to get the air to be warm again but should not have to set the temp to 80+ to get to a comfortable temp. Thinking of doing a service visit on this soon.

Measuring vent air temp is a mistake. Measure the result (cabin) not the output (vent)!! Dumb.

I've had my black P85 for 3 weeks now and finally figured out how to use the HVAC. First get some good glass cleaner and clean the inside of the windshield. The glass cleaner I ordered from Chemical Guys works great. I think what ever glass manufacturing process left a film on the inside of the windshield and it is causing the fogging. Bring up the little screen that controls the fan speed. Take it off Auto and leave the air circulating inside the cabin. I set my temp at 80, fan speed at one and set the vents to only blow in the front vents. If you need to defrost the windshield,use the static defrost button at the bottom. I have not had any fogging issues since I cleaned the inside of the windshield and I drive around in 15 degree weather.. The rear passenger vents seem to only work with the vents set to blow out of the front vents. There is also a blue "Sync temp with passenger" option when you adjust the temperature. Until the temperature/charging app is release. I just unlock my car and not shut the door all the way, (first click) and go back in and finish my coffee while the car heats up. Hope this helps everybody.

On a long trip, auto didn't work well for me at all, and didn't seem to reflect over/undershooting. Instead, it seemed like the sensor was someplace that heated up, so it thought it was hotter than it actually was.

That's disappointing that 'Auto' didn't work for your long trip. I tried what the Tesla engineer recommended - setting to Auto and raising the temp to 76 degrees on my drive back home this evening (37miles). It was actually much better. The front vents never were activated, only the floor vents. And these vents gradually warmed up and maintained warm air, or no air, for the duration of the trip (although not the same temperature the whole time). This was the key difference. The 'Auto' setting allowed the car to dial down the fan when it thought the correct temperature was reached.

WIth 'Manual' fan speed, it maintains the fan speed regardless of sensed temperature, but it is still sensing the temperature of the vents, and will therefore alternate between hot and cold air. This seems like a flaw to me. But Auto did work well as noted.

If it improved in my car under 'Auto' but not in other cars, there could be a separate heating problem in those other cars. I do agree with Brian H though, it seems odd to have the sensor in the vents, and not in the cabin itself. That might have prevented this issue.

I too have noticed the cold feeling in the car. I actually took a thermometer along on a 200 mile trip in 10-20 degree weather. What I found was even though the cabin temp was fairly consistent it would feel cooler and cooler the longer I drove. I just slowly raised the temp setting every 10 miles or so and when it got to 75 the car seemed to feel reasonable although it still was not as comfortable as other cars that I have driven.

My one thought about this is that it may be similar to the difference between the old style furnaces and the new high efficiency ones. With the old furnaces the air coming out of the vents always felt very warm and the house felt warmer too. With the new high efficiency furnaces the air never feels warm and the house tends to never get that "warm" feeling that the old furnaces provided. With ICE cars the air is being passed across a high temp heater core whereas (I am assuming) the air for the S is not being passed over as high a temp differential thereby leading to a cooler feeling.

And yes I am not the youngest person on these forums!

Also I forgot to add that for me I found using the manual mode seemed to provide a better experience for me than the auto mode.

driving with the climate control set to auto at 70F and the seat heater set to one or two was sufficiently comfortable for a 40 miles ride in 13F weather although there is a bit of draft from the bare glass over head.


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