Windscreen mist issue

RobFM · Nov 5th, 2006, 21:08

Ok, I know this has probably come up loads of times in the past, but here goes.

When the air conditioning is "off", it takes about a minute for the windscreen to mist up. Takes longer if the fans are switched off.

Some points to note:

- There is no coolant leaking.
- My car is a '98 S40 T4 - so no cabin filter, or pollen filter.
- The re-circ system has been disconnected due to the relay clicking when normal air folw is selected (not re-circ). This work was done at a Volvo specialist garage.

I am thinking tha latter point is to blame, but i'm not sure.

Any suggestions.....?

st5ve · Nov 6th, 2006, 18:14

Hi.

Windows misting up is fairly common especialy in Winter, try switching the fans on, or when passengers in the car ban them from exhaling!!!

Could be you have a leak in the cabin somewhere causing condensation, has the car been standing for a long time and do you do mainly short journeys?

Viper_7 · Nov 6th, 2006, 18:40

I find the same. If the air-con has been used on a fairly regular basis - and then you turn it off - then the windscreen mists very quickly.

I found that I had to leave the air-con off for several days and then it stopped occuring - drove around with the windows open a smidge and the blowers on medium.

If you have electronic climate control though - keep it on auto. The air-con doesn't just cool the air - which it won't in winter obviously, but also dehumidifies it. modern systems hardly touch fuel economy at all - unless always in use - in hot weather day.
Keeping it active also keeps it in good shape, and the system will last much much longer than if you didn't use it over winter.

Vipes

RobFM · Nov 8th, 2006, 10:53

I have noticed that if I leave the fans on full for a while, the windows do clear. (eventually). Will have to bare with it. Goes like F*** though. (pardon my french)

PNuT · Nov 8th, 2006, 18:14

my s70 used to do it really badly

its never done it since i had the head gasket/thermostat/then engine change... i have no idea why any of the above should have made a difference tho

the aircon in the lorry i drive will steam everything up when its switched too hot, its like a kettle being boiled in the cab..... a real safety feature LOL

Nov 5th, 2006, 21:08	#1
RobFM R Matthews Last Online: Oct 6th, 2007 15:36 Join Date: Oct 2006 Location: york	Windscreen mist issue Ok, I know this has probably come up loads of times in the past, but here goes. When the air conditioning is "off", it takes about a minute for the windscreen to mist up. Takes longer if the fans are switched off. Some points to note: - There is no coolant leaking. - My car is a '98 S40 T4 - so no cabin filter, or pollen filter. - The re-circ system has been disconnected due to the relay clicking when normal air folw is selected (not re-circ). This work was done at a Volvo specialist garage. I am thinking tha latter point is to blame, but i'm not sure. Any suggestions.....? __________________ S40 T-4 '98... BSR Full exhaust

Nov 6th, 2006, 18:40	#3
Viper_7 Premier Member Last Online: Aug 30th, 2013 17:33 Join Date: Apr 2006 Location: York	I find the same. If the air-con has been used on a fairly regular basis - and then you turn it off - then the windscreen mists very quickly. I found that I had to leave the air-con off for several days and then it stopped occuring - drove around with the windows open a smidge and the blowers on medium. If you have electronic climate control though - keep it on auto. The air-con doesn't just cool the air - which it won't in winter obviously, but also dehumidifies it. modern systems hardly touch fuel economy at all - unless always in use - in hot weather day. Keeping it active also keeps it in good shape, and the system will last much much longer than if you didn't use it over winter. Vipes __________________ S60 D5 SE 2004 Titanium Grey Winter Pack Mods: Volvo Tax disc holder - increases power output by 5% Child Seat Rear and side Volvo fitted blinds. Tree Sap from May - July. Removed at least 46 cup holders for weight reduction.

Nov 8th, 2006, 10:53	#4
RobFM R Matthews Last Online: Oct 6th, 2007 15:36 Join Date: Oct 2006 Location: york	I have noticed that if I leave the fans on full for a while, the windows do clear. (eventually). Will have to bare with it. Goes like F*** though. (pardon my french) __________________ S40 T-4 '98... BSR Full exhaust

Nov 6th, 2006, 18:14	#2
st5ve S60 R Last Online: Aug 2nd, 2019 11:43 Join Date: Oct 2004 Location: United Kingdom	Hi. Windows misting up is fairly common especialy in Winter, try switching the fans on, or when passengers in the car ban them from exhaling!!! Could be you have a leak in the cabin somewhere causing condensation, has the car been standing for a long time and do you do mainly short journeys?

Nov 8th, 2006, 18:14	#5
PNuT MaDMaN Last Online: Nov 26th, 2022 18:47 Join Date: Sep 2006 Location: Red Lodge	my s70 used to do it really badly its never done it since i had the head gasket/thermostat/then engine change... i have no idea why any of the above should have made a difference tho the aircon in the lorry i drive will steam everything up when its switched too hot, its like a kettle being boiled in the cab..... a real safety feature LOL

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