981 Cayman Streaming Up overnight

[action09]

I live in the NE of Scotland and now winter is here and the resultant overnight cold temps I get up every morning to find my car all steamed (fogged) up inside, windscreen almost streaming its that bad.

I always have the A/C on, never too high temp either (20degC). Don't think its wet ie a leak

Anyone got similar experience and / or know of a fix?

[LordHaveMurci]

My 996 Coupe was really bad yesterday morning when we had a hardish frost, with A/C on it still didn't completely clear on my 12ml commute.

Not nearly so bad this morning when it was a bit milder.

[Trev450]

Its down to atmospherics. Nothing to worry about. My CS has done it at certain times of the year since I purchased it neary five years ago.

[sootyvrs]

Sometimes had this problem with my previous Cayman R...

I recall reading that some use silica gel packs in the car to absorb the moisture.. Never tried it myself as I sold the car.

[Johnny G Pipe]

My 6T has been like this past few days, especially after picking up damp children. Would a drying bag or two behind the seats help I wonder?
http://www.amazon.co.uk/LARGE-DEHUMIDIFIER-MOISTUR...

[SFO]

try to run the car with AC off for about 15 minutes before turning car off .. this should remove the built up humidity in the system.

at the same time,you will likely need to have the windows down a bit to help keep the windscreen clear

[LordHaveMurci]

SFO said:

try to run the car with AC off for about 15 minutes before turning car off .. this should remove the built up humidity in the system

I thought the A/C dehumidified? Turned mine off 5mins before reaching the office this morning & it started to steam up by the time I arrived. Or should I have opened a window slightly?

[SFO]

LordHaveMurci said:

SFO said:

try to run the car with AC off for about 15 minutes before turning car off .. this should remove the built up humidity in the system

I thought the A/C dehumidified? Turned mine off 5mins before reaching the office this morning & it started to steam up by the time I arrived. Or should I have opened a window slightly?

a/c does dehumidify, it's just that some of the humidity remains in system when you switch it off, and it needs to be 'blown' away .. more of an issue if it is wet and damp

[Ed from Cyprus]

Make sure recirculation if off and car gets in fresh air all the time.
When did you change salon pollen filter last time?
They tend to keep a lot of moist inside a car when bloked orclose to that and don't let in fresh air.

What about drains condition? You may have inside water leaking from outside.

If all of this is OK, may try to put into the car a household dehumidifier for some time. Interior generally may have a lot of accumulated moist over autumn which is dificult to dry out regular way.

But for sure start from recirculation and pollen filter..

I change them on my cars every oil change.

[graemel]

I've just bought from amazon a couple of 1kg bags of silica gel. As per the link above but from a different vendor. The wifes E46 Alpina Cab with hard top fitted is suffering from moisture build up and I do not want it effecting the leather. Her Smart 4 2 cab, well they have always had the same issue. Two bags in the Alpina and one in the Smart. Looks like its working. You can dry the bags out in the oven.

[Hamster69]

Can I suggest you check your footwell carpets. It sounds like you have water in the car. It was very common on the 986, 987 and mist 911 since the 996. Haven't actually seen it on a 981 yet, but there is always a first. Blocked drains are usually the culprit. Yours being a hard top I would think under the bonnet.

Oh and yes the AC draws moisture on to the evaporator. Thus removing it from the cabin. Turning it off to clear moisture, how would that work?

[JeffC]

Cheap fix. if you want to stop anything misting up , mix up some water and washing up liquid and wipe all the windows, I dont run a heater on my race car and even in a down pour it doesn't mist up, we used to have the same problem when racing Karts with visor misting when breathing on it and this stops that too. simple but effective.

[Ozzie Osmond]

Usually damp carpets. Try to be careful about getting in the car with wet feet. And use the car enough with the heater on to dry them.

[shoestring7]

Unless it's been pointed out already, it might be worth remembering that the a/c system won't work below a certain temp (5 degrees, 7?) so you won't get the benefit of the dehumidification at low temps. I think this is to prevent the build up of freezing condensed water on the evaporator.

SS7

[Wollemi]

I think that some cars just steam up more than others. My e46 M3 was terrible, could be dripping wet in the morning and it was shocking in heavy rain, heater and A/c running full pelt, if not the windows would steam up straight away. No trace of a leak ever found and no damp floors etc. My Boxster (987.2) will be fairly wet on the inside of the windscreen on a cold morning but this will clear pretty quickly (with the roof down LOL!)
my Land Rover Discovery 4 has no problem whatsoever, totally dry whatever the climatic conditions, and to be fair the previous Disco 2 was almost as good.
Could it just be a question of the physical size of the interior space?