Windows misting in 2025 model HS PHEV

[Swaineman]

Yes it is set to 19, still on auto but with air from the outside, this has fixed the steaming issue.

 

[1654Dino]

Hi
I have a Dec 2025 PHEV HS and have had the same problem...also the temp set at 22° doesn't seem that warm.
On all other cars I have had, setting the air con to 'on' generally clears the glass but not on this one
Haven't really had it long enough or had enough wet days to experiment fully with settings but it doesn't seem right..
75 miles on electric..possibly if no other electrical components are switched on at all..more realistically , between 50-60 miles on full charge in my experience..particularly if trying to clear the screen and whilst ignoring the constant warnings to keep your eyes on the road..
Great car apart from these things though...

 

[blacktopmedia]

Hello everybody - I am amongst the luckiest boys in the world, for I have a brand new HS PHEV (ok, that may be an exaggeration, but I do really like it!).

In 90% of circumstances, it is the perfect car. It carried all the Christmas shopping yesterday, it’s good at long distance runs l, easy to drive around town, and the 75 mile (alleged) EV range is enough for most of my needs.

It isn’t without its quirks, but I may post a new thread about those, as this one is to ask a specific question.

It’s quite rainy here in the UK at the moment, and I’m finding that whenever it starts to rain, the windows mist up and I have to keep the demist function running permanently to keep the windows clear, which is noisy and annoying.

I’ve got the AC turned on, temp set to 22, recirc off (bringing air in from the outside). I don’t see how it would be relevant, but I use the car in HEV mode rather than EV.

I’ve cleaned the windows properly, and checked the carpets for any sign of leaks (I hand washed the car over the weekend and checked all of the openings afterwards). No leaks are obvious.

I did wonder if it was a quirk of the car, so I rang the salesman I bought it from, but he said that he’d sold the same model to numerous people without any streaming issues I thought, well, he would say that, wouldn’t he? So I called my brother in law who also has a new HS and he confirmed that he had no issues with steaming, so the sales guy may well have been telling the truth (shocker!)

Has anybody else had an issue with steaming windows on the new HS, and if so, how did you resolve it?

 

[MG Clive]

Welcome to the forum @blacktopmedia, did you have a comment to add, you've added nothing to the above post?

 

[blacktopmedia]

Mine is a company car, we have 2 of them, both with the same issues.
The misting/heating issue is driving us to despair.
It seems the air con switches off when the ICE engine does, in PHEV mode. As it flicks in and out of EV mode, the car mists up.
We’ve tried taking them off ‘auto’ and directing the air to the windscreen, temperature set at 21 degrees, air con on. It makes no real difference, however then you are subject to wildly varying temperatures too. One second it’s gently blowing 21 degrees heat on the screen, as per the settings, next minute it’s a sauna and you have to crack a window. It’s ridiculous and pretty inexcusable.
Why is t there a setting to turn the air con on permanently? I’ve never known a car like it.
The active cruise control has stopped working on both cars too, but that’s a separate issue.

 

[Herandnu]

I find the temperature setting quite unpredictable. It can start putting out cold air after a while when it's set to 18 or 19 even in cold weather.

 

[colinE]

I also have the same issue with misting up and like you find the only answer is to run the demist function. I reckon it’s a quirk of the car. The heat control really doesn’t regulate the temperature accurately. Annoying.
Having said that the we have had the car for 12 months now and overall are very pleased with it. The EV range is pretty much as claimed which is better than the two fully electric cars previously owned.

 

[Cafeg]

Try setting the temp to 19, aircon and air from the outside and run it for 5 minutes with the engine starting off before switching to EV Mode. If you use recirc air will also make it fog as its just reusing the air from inside the car. Aircon not heating will demist it, That's what I do with my 2023 mg phev. The Phev models dont have a heat pump and use the petrol engine water for heating.

Swaineman in his message above said it fixed his steaming.

 

[securespark]

Has anybody else had an issue with steaming windows on the new HS, and if so, how did you resolve it?

Refrain from playing Tina Turner?


To be serious, I wonder if it affects the HS Hybrid+?

 

[BPM06]

If you haven't done it yet, try switching up the "auto setting" air flow in the settings for the HVAC
The sound level is much more tolerable than the demist setting - worth a try.

 

[Totti1001]

But "high" is the highest fan speed, so it's the loudest.

 

[BPM06]

YES, Although the loudest, I find it easy to live with and certainly quieter than demist setting. Try it and see.

 

[Bernieboy]

Another update - my local dealer did a marvellous job with the car, updated the software and so on in a very short time. The car was at the dealer for around half a day, and had a proper checkover whilst it was there.

I spoke with the master technician when they called to say that the car was ready and he confirmed that there were no faults found which could lead to misting. The AC was working fine, the levels were good, the drain pipe was unrestricted, there were no misplaced seals and the foam under the carpets was all dry. I couldn't have asked for a more thorough inspection, or a more comprehensive report and conversation; although the result wasn't what I wanted, the inspection was thorough and my confidence was high in the team looking after me.

All of which leaves me with two mysteries. Firstly, what caused the car to steam up in the first place? That question would be more urgent, if it were not for the second mystery - since I've had my car back it's been horribly cold, it's been horribly wet and yet I have had no steaming up whatsoever.

As mysteries go, I'm happy to live with this one, if it continues as is...

I have heard of instances of the software update fixing the misty window problem. Do you know which software version you are on?

 

[SRP1]

I had the misting problem with my 2025 PHEV bought in February. One day, whilst stationary , I just tried going through all the settings on the climate control individually, and all the combinations of settings, at all speeds, with outside air, automatic, and recirculation. Maybe there was a sticking flap or motor within the system, but ever since I’ve not seen any misting on the windscreen. Coincidence??

Since then, I’ve been leaving temp on 22 or 23 degrees, auto, with auto recirc, and fan on medium in the settings menu.

 

[securespark]

I had a real squeaky bum moment In my Xantia TDi...can't remember exactly what I did, but I moved one of the sliders of the heater controls and, instantly, the windscreen went milky white. I couldn't see a damn thing!

 

[Totti1001]

I know this from my old Opel Calibra, where the heat exchanger burst on the motorway and within seconds the windscreen was white.
But back to the actual topic .
I also have to contend with fogged-up windows. Of course, you can turn the ventilation up to the highest setting, but that's just too loud. I've installed wind deflectors on the front windows, which allow me to open the windows a crack without rain coming in or creating a draught. And that way, the windows don't fog up anymore.

 

[Jake Sullivan]

Window misting or fogging is the humidity or moisture inside the cabin that condensates on the inner side of cold glass. To remove the moisture from inside the cabin you need Air Conditioner ON, when the cabin air passes through the AC condenser, the moisture condensates and is drained outside, AC acts as a dehumidifier as well.

Now, AC is essential to removing the cabin moisture. If you are just starting your car, then the fastest way to defog is to use the physical button on the dash, the Windshield Defog/Demist button, it will put AC ON, Fan Speed to high, Temp to HI, Vent to Windshield. Once you have defoggged and want to maintain it during the journey, then best practice would be to set the desired temp, set desired fan speed, Cabin re-circualtion to Auto, AC ON, select vent to windshield (it directs flow to front Windshield, Front Windows and the Side View Mirrors).

Fan Speed dictates the circulation of cabin air through the AC. If you want to achieve the set temperature or defogging faster then increase fan speed but if noise is an issue then set fan speed low and it will get the same results but just in a little bit longer.

Cabin re-circulation should be kept on Auto (denoted by "A" inside the car icon), it will open the vent automatically to mix outside air to control temperature which will help reduce humidity little bit.