Air Conditioner problems of the 1997 Chevrolet Blazer

I bought my rig under a year ago and have been haveing problems with the trasmission,I have run out of gas many times because it doesn't register,my air conditioner doesn't work right,my brakes have locked up a few times and when I turn a corner it sounds like something crahing under my rig. I have had nothing done yet because it is going to cost me a whole lot to have all this replaced. My stereo went dead about a week after I got it also. I thought I was buying a good rig but,now I am finding out different and I paid good money for and am still paying for it. I have replaced the heater core it went out 3 weeks after I got it,the window went out a few day's after I got it and Ford barely replaced that for me.