Fogging windows new car

Cyrus

We changed our car a few months back, this one is brand new and it has an issue i had before with another new car (both audi)

Basically the inside of the windscreen fogs up pretty quickly is slow to clear with the air con (but does) but when it fogs i can see patterns in the fog like concentric circles, almost as if someone had a suction mounted dash cam or something, most bizarre.

Have cleaned the interior of the windscreen with stoner invisible glass but the issue persists, what should i try next?

Atlantic Dawn

What kind of air flow set up do you have on the car and/or are you constantly set to recirculating air with the AC turned off?

Explosive_Cornflake

Hardly any damp in the car? The fogging suggests high humidty.

Do you leave the air con on all the time? Supposedly you should, keeps the car dry and keeps the system lubricated.

Cyrus

https://www.boards.ie/discussion/comment/119849442#Comment_119849442

i dont usually have air con on if its no needed, so if its cold i have heaters on and if its warm i turn on the ac or open a window.

Cyrus

https://www.boards.ie/discussion/comment/119849532#Comment_119849532

i dont think its damp, and its a similar issue on two new cars, the first one was a lot better after we had it valeted and i mentioned it to the guy, just not sure what he did!

i dont think to leave ac on as its an EV and there is a range penalty for it, bit silly but that always prompts me to leave it off.

Atlantic Dawn

I have AC on 100% of the time. Only time I will see misting for a couple of seconds would be if I got in to the car after being soaked in a rain shower or late evening/early morning if it's a particularly cold before I start the car.

Cyrus

https://www.boards.ie/discussion/comment/119849595#Comment_119849595

ok maybe thats what i need to do, still doesnt explain the marks that appear in the mist, i must take a pic!

PsychoPete

Concentric circles could be from the windscreen being fitted. I'd try using an anti fog product like rain x,stoners etc. Use them on my own car and find it very effective

Cyrus

https://www.boards.ie/discussion/comment/119849678#Comment_119849678

that sounds like a plausible reason for those marks, ill try rain x see how i go, thank you

If you have a sunroof check the drains the drains overflow into the car when full, we had a VW in the past that kept fogging up and was slow to clear and this was the cause.

zg3409

https://www.boards.ie/discussion/comment/119849551#Comment_119849551

Best to leave car in auto and air con typically automatically comes on for first few minutes to defog windscreen. Certain times of year are worse than others but if you don't have Aircon on then windows may continue to must up. If heat is off too then windows may continue to mist up. In terms of range only turn off if you need every last bit of range on that trip.

colm_mcm

If there’s marks in the windscreen then surely cleaning it properly is the best option. Dirty windscreen fogs up easier too. Probably not prepped properly.