I run with the air con on all the time, which I believe won't help.

The misting only occurs after an overnight park. I do put the control to screen demist only although not re- circulate, I'll give this a go tomorrow.

I can feel the air blowing out the vents and also see it on the misting so I don't think its the flaps.

I think you may have found the answer. If you run the air con all the time, assuming the temperature isn't too low, it extracts moisture from the air passing through it. That moisture has to go somewhere, so percolates out through a drain under the car. When you park up overnight, the air con internal heat exchanger will gather water droplets so that when you first start up in the morning, a blast of damp air will be introduced into the interior of the car until the heat exchanger is dry once again. This will condense on the nearest cold surface - and that is usually the windscreen.

Below a certain temperature, the air con won't actually work because it self protects so that it doesn't freeze. But when it does work it takes power from the engine to drive the compressor - and therefore will affect your fuel consumption - on some cars quite dramatically. So unless you really need to use it, it's best not to in winter. However it should be run for 10 minutes once a month to keep everything lubricated inside.

The demist button is highly effective at clearing the windscreen because it blows DRY air over the screen which is produced by the air con being on.

(what I dont understand is where all the water thats removed by the air con ends up?)

Ah ha, my questions is answered above by speedsports simultaneous post, ta for that!

Edited 14 January, 201313 yr by fuzzybunny

+1

Though i have to say that cleaning of the inside of the windscreen reasonably frequently does significantly reduce the likelihood of it misting up.

Strangely I find the opposite.

I've cleaned the drivers side of my car and left the passenger one alone. The drivers side seams to steam up quicker. I've tried plenty of cleaners but always got the same results.

To be honest, I'm pretty happy with the fuel consumption but I suppose any improvement is worthwhile.

I tend to run the air con constant, rightly or wrongly, I think you get less long term problems this way. I will however start switching it off before I arrive to park up.

As for the air con all the time, "at this time of the year it won't work"... can you explain?

Pollen filter, where can I find it and I'll check and replace?

Think the first point has already been answered, but I think it is below 5 degrees.

Pollen filter is somewhere down under the dash on the passenger side, I think. It might be mentioned in the Bible Handbook.

Think the first point has already been answered, but I think it is below 5 degrees.

Pollen filter is somewhere down under the dash on the passenger side, I think. It might be mentioned in the Bible Handbook.

Thanks.

I'm going to have a rummage around for this tomorrow, might even have a look in the handbook too.

TP has got all the Elsawin files somewhere, so he might be able to link something.

The pollen filter is under the dash, behind & above the passenger glovebox. However, unlike many cars that locate it in the engine compartment just below the windscreen where it lets in rain water if not seated properly, I'm pretty sure that on the Yeti there's no water sealing function as the filter is actually inside the car. If seated incorrectly. I'd imagine that it just means that some unfiltered air can be allowed into the air vents.

Incidentally, I reckon that there's more to the Yeti's ventilation system than just a few vents & flaps that you control yourself.

Last night on a 70 mile motorway round trip in freezing conditions, I noticed that with the heater set to 22 degrees or higher, air con off, but heating on Auto, very hot air was coming out of the windscreen screen vents & drivers side eye level vent, and to a lesser degree the floor vents, but virtually nothing out of the centre eye level vents.

Turn the temperature down to 17 degrees (brrr) and the amount of air being directed to the screen vents and floor vents had substantially reduced, and there was a great deal more air coming out of the centre eye level vents (albeit cooler). I assume that the system is deciding where the hot air is most likely to be required.

In summer, I've noticed that on Auto with air con working hard, virtually nothing comes out of the floor vents or screen vents, and the eye level vents supply most of the very cold air into the cabin. Which I seem to remember is what the handbook sort of implies by saying that you should open the eye level centre vents wide & direct the airflow vanes upward for maximum cooling effect.

I don't have the h/book to hand at the moment, but I bet there are hints there about demisting in winter!!

Edited 15 January, 201313 yr by speedsport