Quote:
Originally Posted by zapcity1
Hi Fred,
I've read a few threads on here from others that seem to have similar heating 'issues'.
To clarify, my XC70 from cold will heat the cabin as normal. All vents provide hot air up to set temp.
Once the set cabin temp is reached, the windscreen, top and dash vents then emit cold air (as Clan says this varies on the outside temp.). On most days this air is very, very cold and is emitted at quite a rate (about fan speed 4).
It is enough for anyone unfamiliar to ask why its so cold and draughty in the car, even when set at 23-25. During this time, the footwell vents continue to emit hot air.
Measuring the cabin temp. at the sensor, it matches the set point due to it being nearer the floor and picking up the hot airflow from the floor vent, but the dash top is lower by 2-3 degrees. As the air emitted from the dash top is cold and fast moving, it feels much colder anyway.
I get around this by switching to manual hot air from the dash vents only, increasing the temp. and reducing the fan speed to min. This cuts off the cold air emitting from the top of the dash by creating a hot air barrier.
My XC60 and C70 when reaching the set temp., just emit a very gentle airflow that is similar to the cabin temp., so no noticeable cold airflow.
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That is found to be the best way of removing mist and damp from the inside of the screen , this was discovered in tests by by Lucas way back in the 1960's when heaters were first fitted as standard . Warm is not necessarily better . cool air at face level keeps you fresh and awake . Today with AC the incoming demisting air is also dry which helps even more .