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Originally Posted by Ex-NISSAN
Can you check something for me. When you first start the car on a hot day (ie inside of car is very hot) with Auto button pressed which vents does air come out of, on my car it is only the vents to the screen, consequently the temperature in the car hardly decreases.
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When the inside of the vehicle is hot and the Aircon is set to Auto (with Auto light ON & AC light ON) the air will be distributed where the unit wants it to be distributed, mainly it will come out of the screen vents as this will force the cooled air up, which in turn (thermal dynamics) will drop to the floor as the hotter air will tend to rise. This will give you the best cooling effect. If the cooled air was distributed via the footwell vents it would take much longer for the hot air to be removed (stratification will occur).
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Also with A/c switched off with OFF button, and then you press the button for the face vents does air actually come out of the face vents (I think it should?) on my car no air comes out, although the fan is running.
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If you select the 'Face' vents, you will need to rotate the right hand dial (Fan Speed) to the speed that you require, it will normally be set automatically at a low speed. When you switch back to auto the speed will decrease, if you then reselect 'face' you will need to again adjust the fan speed as it does not remember it!!
It is a bit of a niggle, but I find that if you leave 'Auto' = ON, 'AC' = OFF, everything works as it should, and it is very quiet. If you need demist, just select demist, if you need AC turn the AC to ON.
Hope that helps you.