Demister Troubles

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Originally Posted by Tusker

Thanks for this. It's been my experience - turn on the demister & the windscreen just fogs up more quickly - all that warm, moist air condensing on cold glass.

Just a Defender thing you live with.

How successful are those wingtop scoops at keeping the rain out in the first place I wonder?

Regards
Max P

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Max
Unfortunately all the wingtop scoops that I have seen have the scoop facing the wrong way ie. facing forward which allows the water to enter the scoops under pressure as the vehicle is driven forward.I believe the scoops should face backward and allow the negative pressure created behind the scoop to take the water away from the entrance to the ducting and limiting the water that gets into the heater box and fan motor.I have found that my Defender doesn't need any ram air effect,as the fan motor is able to supply ample air flow without scoops.

Wayne

On the bottom of the air inlet box under the guard is a small one way rubber valve set up.
It is towards the back and under the air inlet box . Take a look from the top with a torch and I think you can see it Feel around for a small rubber fitting , squeeze it and water will come out.

It's designed to let water out but not in. Leaves , dirt etc will clog it up

years ago service stations had antimisting paper they gave to customers. It was wiped on the inside of the screen and stopped it fogging up. I know about these because my dad was the printer who printed them. But I do not know how they worked or if still available,

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Originally Posted by LowRanger

Max
Unfortunately all the wingtop scoops that I have seen have the scoop facing the wrong way ie. facing forward which allows the water to enter the scoops under pressure as the vehicle is driven forward.I believe the scoops should face backward and allow the negative pressure created behind the scoop to take the water away from the entrance to the ducting and limiting the water that gets into the heater box and fan motor.I have found that my Defender doesn't need any ram air effect,as the fan motor is able to supply ample air flow without scoops.

Wayne

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Agreed

But presumably they would keep most of the rain out when stationary e.g. while parked going nowhere in Sydney's rain of the last few days.

Regards
Max P

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Originally Posted by Reads90

Go to super cheap or repco and get rainx for inside

It stops the mist you get on the inside when it rains

Not the cheapest but really works. Used to use it all the time in the Uk bit don't really need it so much in Brisbane


Sent from my iPhone

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Agree ^^

Its called "FogX" and is worth its cost.

Air from the heater travels through the lower dash and then vertical to the vents. There is a piece of vacuum type hose that connects the lower dash to each vent. The hose can dislodge causing much reduced air flow to the windscreen. This might be a reason, particularly if one side is better than the other.