need some help guys.. my car blows air but its not cool at all. I think i ran out of freon and the car tripped the compressor off for some reason. This all happened over night. the a/c pulley is turning but the clutch is not engaging the compressor. I have heard that in some cars you can follow the electrical line out of the back of the compressor until you find a clip and trip the switch to turn the compressor back on.. does such a thing exist in our cars? if so where is it?

I tried refilling the freon but since the compressor is not running it would not take in any..

Also, i can not run my a/c at full blast. when i turn it up past about the "3" setting it just stays at the same speed..

So any help is much appreciated I am really trying not to take it into the shop to have it repaired..