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Cold Air in Cabin

KN4TX

Member
Sep 9, 2020
6
2
Tuscaloosa, AL
Model S, Extended Range, born on 5/2020. Delivered 6/2020.
My Climate Control has stopped functioning properly. In addition, COLD air comes into the passenger footwell regardless of setting. If you turn off CC, there is a cold breeze blowing in around the feet of the passenger. This is after a recent visit and repair of HVAC sensor.

While driving last month, the heat would not regulate. With the temperature set to 73 or 77, the temperature went to 81 every time. When climate control was turned off, cold outside air immediately begins to circulate in the cabin (when “off” should stop all flow of air.) As I stated above, this is worse in the passenger side. When the cabin is at 81 and the outside air is blowing in at your feet at 45 degrees, this becomes intolerable.


I tracked the operation using the Tesla app during a drive from Birmingham to Tuscaloosa (45+ miles). Outside temp was in the mid 40s). I have screen captures from the app; temperature was 72 degrees in cabin, climate control off, time stamp 9:15. Turn climate control from off to on, temp set at 77. Temperature hits 81 degrees in 2 minutes (less than, and would still be rising but turned off as heat was oppressive in cabin), time stamp 9:17. Next, turn off Climate Control, time stamp 9:18. Cabin temperature drops rapidly from 81 to 72 (3 minutes), time stamp 9:21, because cold air is entering cabin at passenger side foot level (very cold air). With CC off, air inside the cabin should not be changing, nor should cold air be rushing in at footwell. There seems to be no regulation of temperature in the cabin (just goes to 81 degrees whether it is set at 77 or 73.

What should I do next? Last visit the evap temp sensor was replaced. This seemed to fix my AC issue, but this temp issue is intolerable. My wife won't ride with me without a blanket to cover her feet and legs.
I really hate the thought of driving the car to Nashville again, closest service, but I see no option.
 

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CraigE1965

Member
Apr 10, 2018
71
76
Mi
I can't help you. But I have noticed that on my 2017 S, I used to be able to sit in it while charging and have the heat work fine forever. This winter they changed something because they added Netflix (SO YOU CAN SIT IN YOUR CAR WHILE CHARGING!) but now after about 20 minutes, you are correct, the heat goes off and it blows cold air inside even when you set the temp to 80 F or HI. Seems like the only work around is to unplug the car, turn it off/on and then re plug it in, then you get another 1/2 hour or so of heater before the software screws up.
 

KN4TX

Member
Sep 9, 2020
6
2
Tuscaloosa, AL
I can't help you. But I have noticed that on my 2017 S, I used to be able to sit in it while charging and have the heat work fine forever. This winter they changed something because they added Netflix (SO YOU CAN SIT IN YOUR CAR WHILE CHARGING!) but now after about 20 minutes, you are correct, the heat goes off and it blows cold air inside even when you set the temp to 80 F or HI. Seems like the only work around is to unplug the car, turn it off/on and then re plug it in, then you get another 1/2 hour or so of heater before the software screws up.
 

KN4TX

Member
Sep 9, 2020
6
2
Tuscaloosa, AL
I can only hope it's software and not a duct issue. The later would require getting into the dash. Software is annoying, may not get fixed, but at least there is an easier chance of repairs/fix.
 

double07

Member
Jun 16, 2020
7
0
Mass
My S was born and delivered exact time as yours. The AC stopped working early fall 2020. I had to bring to service. They said the temperature sensor need to be replaced. Everything works perfectly afterward. I am wondering if yours is having similar issue. You might want to have the service look at it. Good luck!
 

KN4TX

Member
Sep 9, 2020
6
2
Tuscaloosa, AL
Yes, also had the temperature sensor replaced. Same as you. Things seemed great after change, then back to not working correctly. I need to go back to Nashville, but it's a full day adventure (2-day when you include return to pick up car.) double07, is yours still working correctly?
 

double07

Member
Jun 16, 2020
7
0
Mass
double07, is yours still working correctly?

Since, it is winter here in NE. I have not tried the AC recently. So, it's hard to say if the issue is back or not? At least, the temperature is set to what I set to where as it wasn't before the sensor was replaced.
 

Jughead135

Member
Feb 19, 2020
195
83
Georgia
I can't help you. But I have noticed that on my 2017 S, I used to be able to sit in it while charging and have the heat work fine forever. This winter they changed something because they added Netflix (SO YOU CAN SIT IN YOUR CAR WHILE CHARGING!) but now after about 20 minutes, you are correct, the heat goes off and it blows cold air inside even when you set the temp to 80 F or HI. Seems like the only work around is to unplug the car, turn it off/on and then re plug it in, then you get another 1/2 hour or so of heater before the software screws up.

Would putting it in “Camp” mode solve the issue?
 

CraigE1965

Member
Apr 10, 2018
71
76
Mi
No, Camp mode still doesn't have heat, only cold air blowing in. I have found the best solution is to just reboot the car every 20 minutes. Not happy with this solution or the loss of rear audio since MCU1 to MCU2 "upgrade", but hey, at least the browser works now, kindof.
 

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