RE: Winter Heating Issues
I don't seem to have that problem. With the setting set to 'down' only, I can feel heat coming into the footwell. Don't use a high fan speed though, else the cooling effect of the fast air outpaces the heating effect!!!
It isn't 'strong', like an ICE after it has warmed up, but it is sufficient. I do tend to get low circulation in my feet but I can't say I have had a problem with it.
I have not sought to find out how much air is put onto the screen when it has footwell-only setting but it clearly puts some there sufficient to keep the car demisted when it is just me. It does struggle a bit with more than one in the car though, so I don't think it puts a large amount of air onto the screen.
It sounds like there is a variable amount of air coming through the steering wheel areas on our cars. I did not notice until one of you other chaps mentioned it. So I presume mine is less than his. Others have said there is nothing. You might have a 'big leaker', then! I rolled up some 1mm packing foam into the right shape and stuffed it into the adjuster aperture. That probably shifts whatever air it is to somewhere else I expect, but it must reduce the total flow rate by some amount.
When I first started experimenting with the heating, I tried all settings from hi to lo. It really does struggle to put lots of heat in, that much is true. You can set it to 28 if you like and it makes no difference if it is 5C out to whether you set it to 23C, it is pretty much running flat out. But that does seem to be enough for me. I drifted towards 19C as this seems to get up to sufficient temp after a while.
Although the heat is fairly instant, unlike an ICE, still the car itself is cold and that can take a while to heat up and make the air coming through that much more effective, though with preheat it should be less of an effect.
My best recommendation is to leave it set to 19C, one fan level and to the feet only, and let it do its thing. It doesn't give you instant heat, but it does warm up to a tolerable level then, if you leave it alone and forget about it to do its own thing.
Fiddling with the heater controls up and down is the worst thing to do because even if the cab is not at, say, your preferred 25C setting and you nudge it down, it appears to be dimwitted enough to cut the heating and start putting cold air in!!! So set it to 19C and leave it there. It is almost undistinguishable from 20 to 23C settings in that at those temps it appears to try to limit the heating power into the 1 to 2 kW range in any case.
You should also try putting something in the footwell behind you. This helps prevent the warm air bleeding off into the back of the cab.