99' Chevy Tahoe Air Conditioner not working

It doesn't blow cold air? Doesn't come on at all? What's the problem? If it doesn't blow cold after a charge, it leaks. Either on the compressor or in a line or both. To start at the dealer, a compressor is about $1200. That's what they told me. I have two leaks. You can buy remanufactured compressor on ebay for under $200. Or find a good shop (polar bear around here) with reasonable prices and have them do it for something in between.

If it no air is moved at all by your climate control system, the blower motor could be fried, the switch may have gone bad or a fuse is blown perhaps. If it moves air, but not cold air, recharge it and see if it stays cold. If so, great! If not, find the leak.