Insane Interior Temp Reading

[Baldinger1]

Interior temp constantly fluctuating between 122F to 72F. 2021 June delivered Model Y is parked in a 68F garage. Service Center could not explain. AC also blows cold air for 5 min and then just warm air regardless of setting. Any ideas? Are the issues related?

 

[carlos31820]

Probably the cabin temperature sensor. I think its below the 15 inch screen. You could try to disconnect and reconnect it.

 

[avs007]

You would think a faulty interior sensor that reads high, would cause the A/C to run cold longer, rather than warm... I had a car many years ago, where the interior temp gauge always read 65 degrees when it stopped working, which caused the climate control to always think it needed to warm the cabin, so it ran the heat... Putting the climate control in manual allowed me to blow cold air... So I'm not sure what could be causing your A/C to always blow warm regardless of settings...

 

[jcanoe]

Did you try and reboot/reset? (While parked, press and hold both steering wheel scroll wheels for 10 seconds. The Tesla computer(s) will reboot.)

 

[damonbrodie]

i would guess Tesla disregards out of bounds sensor readings in software. it still has the exterior temp it can use as well for a fallback....

 

[Johnny Vector]

There is a shadow recall for HVAC temperature sensors, which might be related to your issue (probably not, but for what it's worth...) I took my 2020 MY in for a separate recall (check seal of control arm ball joints), and while it was in they also warranty-replaced a couple temperature sensors based on the VIN. I had previously noticed that the HVAC was inconsistent in controlling cabin temperature. Now it works as well as I could want.

They replaced:

PT Sensor, Low Pressure, 1 each
PT Sensor, High Pressure, 2 each

The cabin temperature sensor was not replaced, according to the invoice. So your issue may be unrelated, or maybe you have this and a bad cabin sensor! I agree with Carlos31820 above that with values fluctuating that much it's likely a bad connection somewhere.

 

[carlos31820]

You didn't mention this but there is an existing bug with the temperature sensor that can happen after a windshield replacement. I think I read on another thread that the fix is to get software pushed to the car (even if already on latest version).

EDIT: Here is that other issue...

Interior reported temperature incorrectly high after windshield replacement

After front windshield replacement, two issues began to occur consistently 1. Interior temperature of the car is detected to be unreasonably high after overnight sleep. The interior temperature shows as high as 37C/99F immediate after car wake up, where the ambient temperature is 12C/54F. The...

teslamotorsclub.com