De-misting the windows

**mike7** · 20th July 2012, 07:47 PM

Hi everyone,

Had my first trip up to the snow in my D4 and is the first time taking it somewhere colder than home. Wanted to ask about de-misting the windows.

I know manual states the widows will fog up in recirc so need to have fresh air coming in. I tried the aircon in recirc as we were getting the cars ahead exhaust and within a very short time the windscreen would fog up so back to fresh and exhaust fumes from the guy in front.

in my previous car (not a LR) I could set a warm temp in the car but have the aircon on as well so the car wouldnt fog up in recirc but it appears I cant do this in my D4. It was either fog up or cop exhaust fumes from the guy in front the whole way, got really frustrating as I had to keep alternating and opening windows to get the exhaust smell out of car.

Is there a trick to this? Am I missing something? I dont have pollution filter etc, its a My11 2.7L D4.

Cheers
Mike

**PJJ** · 20th July 2012, 08:49 PM

G'day Mike

Did you try turning the temp. dials down to where the air cond. cut in. Used to work for me in the previous D3 but only trouble is you then get cold

- clear windows though

Phil

**101RRS** · 20th July 2012, 09:28 PM

I cannot speak for a D4 but on my D3 equiv RRS when you push the window demist button it also does a cycle that demists the front and side windows as well as the rear window.

What does your handbook say - if in doubt - read the instructions

**mike7** · 21st July 2012, 07:38 AM

Gday Phill, tried the low temp thingy but still didnt work. Was almost like the aircon wasnt cutting in.

Gday Garry I know about the de-mist button and all that does is turn the fans up and it turns off recirc, it certainly clears up the misting but so does manually selecting fresh air.

Thanks guys
mike

**Graeme** · 21st July 2012, 08:51 AM

Originally Posted by mike7

in my previous car (not a LR) I could set a warm temp in the car but have the aircon on as well so the car wouldnt fog up in recirc but it appears I cant do this in my D4.

This works on my D4. Make sure air is going to the windscreen vents, not just the upper vents.

**101RRS** · 21st July 2012, 10:06 AM

Originally Posted by mike7

I know about the de-mist button and all that does is turn the fans up and it turns off recirc, it certainly clears up the misting

i thought that is what you wanted to do

**Fred Nerk** · 21st July 2012, 10:19 AM

I know this won't help you, but I opted for the "cold weather pack" It is one of my favourite luxuries. any one who is tempted I would say "go for it".

The heated windscreen is effective (but don't try to mount an on glass antenna on it which is another story). The heated mirrors clear quickly. Heated seat and a heated steering wheel complete my solution to a cold morning in the hills where I live. The demist button clears foggy windows in seconds.

**discotwinturbo** · 21st July 2012, 10:26 AM

Originally Posted by garrycol

i thought that is what you wanted to do

He wants to be able to do the same but recirc on due to following other cars and ingesting others exhaust fumes.

Brett...

**mike7** · 21st July 2012, 11:47 AM

You got it Brett, I can de-mist the car but was hoping to do it in recirc to stop fumes. The de-mist button works really well but using fresh air obviously.

Cheers
Mike

**101RRS** · 21st July 2012, 12:53 PM

Understand now - I think you are (we are) screwed then as you can turn the "auto" function of climate control off but not climate control itself.

On non climate control cars you can have the A/c on, on recirc and the heater on and the heat from the heater overrides the cold from the A/c so you get heated dehumidified air that defoggs the windows.

With our vehicles switching off the climate control only switches off the auto fan control and auto vent control but leaves auto temp control on so the system will provide a mix of a/c and heat as required. If the temp is really cold switching the temp to the minimum will not do anything (as you have found) as it will still be trying to heat.

So the simple answer is as you suspect - can't be done on recirc.

However - I live in Canberra and have much lower temps than you and have found the same issue. It mainly fogs up when you first start up the car and drive off - I have found that using the demist program clears the screens pretty quick (yes there is outside air coming in) and the switching back to normal climate control on recirc the problem does not come back - if it does normally another go at the demist program does the trick but I only ever have a max of two people in the car.

It is a shame that when climate control is turned off you cannot separately control the A/C and heater.

I thought all D4s had the pollen filter in the ventilation system - it certainly does not stop engine fumes though.

Garry

Garry

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