>>so many people seem unable to use the heating and ventilation controls to any useful effect.
A friend insists on putting maximum heat to face level vents, frying the eyeballs while the feet freeze. They cannot be convinced otherwise, even though the car's got climate. They had the car for over a year before I pointed out it had A/C! One journey in the Summer caused the windscreen to collect condensate on the outside necessitating the wipers. I did manage to convince them to re-direct the air from the 'screen vents.
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