Cayman 981 GT4 windows misting in heavy rain

[GeeDog]

I wonder if 19c is a bit cool in heavy rain and with these low ambient temps we've been having? Maybe it's as simple as try a couple of degrees higher and see...? My 981S has been sitting at 21-22c recently. Is it the same ventilation system on the GT4?

 

[AndyOhara]

Chaps,

I need some help if possible please. I got caught out in a rather heavy downpour yesterday afternoon and although I had the climate control set on 19°C, when I came to a stop at a set of traffic lights the windscreen, side windows and rear screen misted up almost immediately. I hit the demist button for the front and rear screens immediately which cleared the front and rear screens quite quickly but when I turned them off and went back to 19°C the windows misted up again when I came to a stop at a junction.

Has anyone else had this happen or have any idea of how to stop this happening? I did a quick Google search and a lot of forums are suggesting water ingress and wet carpets, albeit on older cars, but my carpets are bone dry and there's definitely no water ingress anywhere in the car.

All the glass in the car has been cleaned with GTechniq glass cleaner on a regular basis.

Hopefully someone will have a solution?

Cheers,

Andy

 

[AndyOhara]

I wonder if 19c is a bit cool in heavy rain and with these low ambient temps we've been having? I wonder if it's as simple as try a couple of degrees higher and see...? My 981S has been sitting at 21-22c recently. Is it the same ventilation system on the GT4?

Maybe you're right that 19°C is probably a little too low especially with the lower ambient temps over the weekend and I should have had the climate set on 21°C-22°C. As far as I'm aware the ventilation system is the same across all 981 Cayman variants. Next time I get caught out in a downpour I'll maker sure the climate is set a couple °C higher.

 

[GeeDog]

Worth a try, eh? It'll be the cheapest mod you ever make Andy!

 

[Mark Dovey]

Hi Andy, my one does that too… doing some research and having a think about I think caymans and boxters are prone to a bit of misting up inside. I think the Reason being is although insulated - ultimately the engine does create some heat and atmosphere within the cabin due to its location.

I could be wrong but surly there has to be some sort of effect with the mid mounted (in cabin) engine.

either that or need to get down to Porsche with some urgency lol

 

[AndyOhara]

Hi Mark, very valid point regarding the heat from the engine. I may call my OPC tomorrow and ask about the misting and mention the heat from the engine. I have access to a 2017 BMW M4 Comp and that has no misting at all in the rain regardless of what temp the climate is set on. It must be something to do with the engine in Boxsters and Caymans

 

[Mark Dovey]

Let me know what you find out Andy … I would be very intrested to know

 

[AndyOhara]

Let me know what you find out Andy … I would be very intrested to know

Definitely….will do.

 

[Motorhead]

Andy,

Are you sure that your aircon is actually switched-on and working? Normally it should be more than adequate to prevent any moisture build-up.

What happens if you put the system on recirculation?

As suggested, increasing the temperature should help. In the cooler weather I normally set it at 21 deg C for comfort.

Jeff

 

[AndyOhara]

Jeff,

Thinking about it now I may have inadvertantly switched the aircon off as I think the red light was illuminated on the A/C Off button which means A/C is off. I honestly can't remember now.

Think it's probably best to leave it on Auto/Sync and in future have the temp sync'd at 21°C or higher if it's raining. I'll also have to try recirc too and see what happens when that's switched on.

Cheers for the tips and help.

Andy

 

[Twinfan]

Red light on = AC on

I'm thinking you may have turned the AC off, or if it hasn't been re-gassed in a while it may need refreshing. With AC working as it should I don't think the car should mist up at all, even at your 19 degrees setting []

 

[s999sws]

I think you will find that if the A/C led is on then then the A/C is off. Page 58 of the handbook. SWS

 

[AndyOhara]

I'm pretty sure I hit the A/C Off button in error as there was a red led illuminated on the left side of the climate switches and it wasn't the A/C Max button that was illuminated, therefore, aircon was off hence the misting up.

Chaps, thanks for your responses and note to self….read the manual!!

Cheers,

Andy

 

[Twinfan]

On my 718 GT4, and in the Porsche "Good To Know" app for the car, the aircon cooling function is on if the red light is on. It's off when it's off.

I'm sure my 981 GTS was the same but I could be mis-remembering! Apologies. Porsche like to mess about with this stuff between models but the manuals aren't always correct either...

 

[Scrounger]

Mine misted up in the autumn last year. I applied some Gyeon Anti-Fog to all the windows and it hasn't misted up since.

 

[JohnCRS]

On my 981, if the light on the aircon switch is glowing, the aircon is off. Weird. In wet weather the screens will only stay clear with A/C on, i.e. light off.

 

[corneg1]

When I had a Cayman (all be it a gen 1) I had a misting up problem too. It was resolved by a re-gas of the AC system. You would be surprised by what you think is cold air once you have had a re-gas.

 

[AndyOhara]

I think I have now resolved the problem by having my A/C re-gassed. I didn't realise that it needed a re-gas until I was in my wife's M240i, which is two years old and she had the climate on 17°C and it was quite cold. Now mine is re-gassed and very cold as it should be.

Thanks for all the tips, pointers and help and thanks to ADH Independent Porsche Specialists in Rayne, Essex for re-gassing the A/C in my car.