Why is Model Y useless at demisting windscreen?

[Smileysam]

If it’s user error please correct me. I just use auto all of the time when I drive. When I get in the car and it’s misted up I press the front windscreen icon twice to get it to show max.

Are you not using the windscreen demist setting in your AC? You should try that as auto tends to blow towards the feet rather than your windscreen.

 

[Sixer]

Read the thread from the start

 

[Skavatar]

A/C to dehumidify the air. Recirculate to keep additional moisture from coming in.

 

[Foxsbiscuits]

Recirculate to keep additional moisture from coming in.

This is a bad idea if you want to reduce humidity. You'll be recirculating the cabin air which will become more humid because of passenger's breathing.
AC on, auto, no recirculate = best in this example.

 

[Big Earl]

My dad is having problems with windshield fogging in his 2023 Model Y. He had been running the system in manual mode but says the problem persists in automatic mode. I’m going to take a look at it tomorrow. No such issues in our 3s or X.

The problem with my dad's Y ended up being the cabin fan power connector not being fully seated on the VC Left module. There was no climate control at all, but Tesla fixed it with a quick service appointment.

 

[Kenners]

If its a software tweak it means the revised
model Y won’t just be losing the stalks

 

[Skavatar]

This is a bad idea if you want to reduce humidity. You'll be recirculating the cabin air which will become more humid because of passenger's breathing.
AC on, auto, no recirculate = best in this example.

hmmm, my family and I always use A/C + recirculate and don't have any issues, maybe Houston air is more humid. Even with 6 people in the minivan the A/C is able to remove the moisture from 6 people's breathing, and we don't even have it on high setting. I've owned Accord, CR-V, and Sportage. My wife has owned Protege, Corolla, and Model 3. My parents have owned Accord, a few Camrys, MPV, and 2 Siennas.

 

[Foxsbiscuits]

hmmm, my family and I always use A/C + recirculate and don't have any issues, maybe Houston air is more humid. Even with 6 people in the minivan the A/C is able to remove the moisture from 6 people's breathing, and we don't even have it on high setting. I've owned Accord, CR-V, and Sportage. My wife has owned Protege, Corolla, and Model 3. My parents have owned Accord, a few Camrys, MPV, and 2 Siennas.

Your example "works" but it might not be for the reason you think, for instance some systems will only run recirc for set periods before switching to outside to ensure fresh air comes in. There also may just not be a humidity issue in your area. Or I could be wrong about what's happening in this system.

I don't know the full technical details, I tried researching it and got lost in an endless HVAC forum... There's a lot of different systems and opinions.

 

[Big Earl]

hmmm, my family and I always use A/C + recirculate and don't have any issues, maybe Houston air is more humid. Even with 6 people in the minivan the A/C is able to remove the moisture from 6 people's breathing, and we don't even have it on high setting. I've owned Accord, CR-V, and Sportage. My wife has owned Protege, Corolla, and Model 3. My parents have owned Accord, a few Camrys, MPV, and 2 Siennas.

Do you guys enjoy breathing one another’s exhaust? That’s a lot of people breathing in a small space. CO2 concentration must be off the charts if you really do roll around with six people and recirculate turned on.

 

[Foxsbiscuits]

Do you guys enjoy breathing one another’s exhaust? That’s a lot of people breathing in a small space. CO2 concentration must be off the charts if you really do roll around with six people and recirculate turned on.

Another reason to think it might be either cycling recirc or always bringing a bit of fresh regardless of setting. Or someone just has a window open .

 

[Js1977]

Do you guys enjoy breathing one another’s exhaust? That’s a lot of people breathing in a small space. CO2 concentration must be off the charts if you really do roll around with six people and recirculate turned on.

Yes. Needs one of these

 

[Pink Duck]

Recirculate is never 100% internal, usually 5–10% of external air mix is included. Which is why it is advised to disable periodically on longer journeys.

Next best thing after HEPA/BWDM in terms of cabin air quality (in terms of PM2.5 / PM10).

 

[Skavatar]

we prefer recirculate over car/truck exhausts here in Houston traffic. we're in our vehicles no more than about an hour when we go down to the coast to go fishing, but usually thats only 45minutes b/c we stop at Buc-ee's. most of our daily trips are only 15-30mins.