Howdy,my AC stops blowing cold above 1800 rpm.I have 90,000Miles on It ,I also have a Horton fan clutch,any idea what went bad.thanks......

 

Can you tell if the compressor is cutting out/shutting off at 1800RPM? If so, my first guess would be that you may be a bit low on freon and that at 1800RPM, the low side pressure is dropping down enough to cause the low pressure safety to cut out. Get a set of AC gauges put on it to see if you have a full charge.