XF_boy

HI guys,

I have a question for you all. On cold nights, when I turn the heater on to demist the front window on my XF, it fogs up even more. Why is this happening?

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Mother Nature

It fogs up because the warmer air in the car from your body heat.

Warm air against a cold window fogs it up.

Try using cold air to demist & then leave your window a little open when using the heater

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Jamie XR6

If you have an AC, use that to demist the windscreen. It works quicker than any other way. Hot air actually mists it more until the temp of the glass and interior become equal.

As Mother Nature pointed out, leaving the window open a touch also helps.

My AU series 1 was always fogging up, I've never owned a car that was a bad as it for fogging. The slightess hint of rain would be enough to mist the windscreen.

I bought a product from a market called Mist Away. Its one of those Demtel, as seen on Bert Newton type of product. You put it on the windscreen/mirror/glasses etc, let it dry and buff it off like a polish.

It is the best stuff I've used. Glass would last up to aorund six weeks before it would start to fog up again. Even the bathroom mirrors wouldn't fog.

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xacoupe

I find that with a 6 or 8 cyl leaving the air co on 24/7 helps a heap. I have found it make little dfference to economy and I never get fogged screens. Running it all the time also means the seal dont deteriorate as fast as leaving it off 1/2 the year

Swampy

As said previously, if your AC works, turn it on.

Be sure to use flow through fresh air from outside and not reverse cycle.

Check that your fresh air to reverse cycle actuator is working; you will notice a change in tone and fan volume.

The actuator ducts are prone to breaking and jamming to fresh air all the time so some people put a screw in them to hold them on reverse cycle.

Cheers

Swampy