defrosting question

i have a 02civicEx. the car wont let me put heat to the windshield!!!!
i put the "vents" button to windshield. the air/heat knob to heat and
the knob for "air speed" to any amount and the car automatically puts
the air conditioner on. this sucks and sumbody plz help!!!!

"02civic" > wrote in message
ups.com...
> i have a 02civicEx. the car wont let me put heat to the windshield!!!!
> i put the "vents" button to windshield. the air/heat knob to heat and
> the knob for "air speed" to any amount and the car automatically puts
> the air conditioner on. this sucks and sumbody plz help!!!!
>
The AC automatically comes on when you turn on the defrost, to dry out the
air directed at the windshield. The theory works like this. First the AC
cools the air, which then has the ability to carry less moisture, so that
much of it condenses and goes out the AC drain hose. Then, the heater coil
heats it up, resulting in warm, dry air, which is exactly what you want for
defrost purposes.

My 1999 Civic does this. When I turn on the defrost and the heat, the AC
light comes on every time. It is supposed to do that.

Earle