Mick F wrote:If there's dampness internally with a modern car, it must have been brought in.
Err, well probably.
Opening the door brings it in - do you have a way of opening the door without it getting in?
My limited knowledge of physics suggests opening a door creates a pressure drop in the car which sucks air in - which I'm guessing is from outside.
Turning the blower on to get warm - odds are that's from outside too.
You can of course turn the air recycling on but if you've got 4 wet bodies rammed into your car that might be a mistake.
And of course the air could have been damp when you were using the car the day before but the temperature wasn't conducive to condensation.
The next morning with a drop in temperature the same air could quite easily condense.
And of course there's timing, it's predominantly a function of early mornings. If you no longer go out every morning first thing in your car then the odds of it happening are significantly reduced.
Besides, a bit further up thread you were saying you always have the "CC" on so I'm not sure why it suddenly has nothing to do with aircon other than it suits your current argument?