I have a Picanto which is 2 years old. I am not sure if there is a fault or if it is normal. When I put the A/C on without pressing the dedicated front windscreen button it is cold..... If I press the dedicated from windscreen button then the air that comes out of the vents by windscreen is warm even though the A/C is on. If I then press the windscreen button again to go back to using vents on dashboard it is then cold again this is with the temp set at 16. Is this normal? or should it be really cold when windscreen button is pressed?