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HVAC Control - for those over 50

rjpjnk

Member
Mar 12, 2021
715
375
NJ
Please describe the circumstances under which your car turns on the heat (blows hot air) in the summer.
It happens under various circumstances, but one that I notice frequently is when the cabin temperature is very close to the target temperature set. As the AC reaches the set point and the system no longer needs to reduce temperature but just to maintain temperature it seems to sometimes over react and puts out heated air instead of just recirculating the existing air without additional cooling.
 

DarthStar

MYP MSM Tow
Jul 7, 2021
130
189
Carlsbad CA
It happens under various circumstances, but one that I notice frequently is when the cabin temperature is very close to the target temperature set. As the AC reaches the set point and the system no longer needs to reduce temperature but just to maintain temperature it seems to sometimes over react and puts out heated air instead of just recirculating the existing air without additional cooling.
My MYP does this exact same thing: SW 2021.11.102.
 

fiatlux

Member
Jul 28, 2018
17
31
Palo Alto, CA
In Cali, we often have cool mornings with hot afternoons into the evening. For my early morning drives, it is often around 60 degrees out. This is warm enough for me, but with the "AC" temp set to 68-70 from the day before, the heater kicks in making it uncomfortable and wasting energy. So I turn down the temp. Then later in the day I get in, and the AC is *blasting* trying to get down to the 60-64 I set it to in the am, so I turn up again to 70. It's a constant dance and annoyance.

FWIW, I previously had a honda accord from around 2006 that had *much* more intelligent auto AC that rarely if ever made it uncomfortable.
 

rjpjnk

Member
Mar 12, 2021
715
375
NJ
I hear you. It is such a hassle. The Tesla system could probably be fixed with a software change if they ever take it seriously. They have so many different temp and humidity sensors it is a shame to see them mess up so bad.
 

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