Air conditioner blowing warm air

A number of reasons could cause the air to turn cold at higher compressor speeds. Get a real set of A/C manifold/gauges and hook up both suction and discharge. Engage A/C and check for at least 5 or 6 to 1 compression across compressor. Suction side should be around 40 give or take. Discharge should be at least 200+ if compressor is good. I like to see around 45 suction to 280 discharge If you see 50+ on suction and less than 200 on discharge, you are getting bypass on compressor and made need to replace it. If you have less than 40 on suction, add a little Freon R134a if you have the quick disconnect ports and R12 (expensive if you do not already have some on hand.) If you have the screw type connectors. 1995 was change out year. Most newer systems have a cutout to prevent compressor running if Freon charge is too low.

What? "you cannot tell if the system is charged by the gauges?" That is how I tell- and everyone I know does too. You can tell if the pressures are right then its charged properly. Yes sure you can vacuum the system and put the exact amount in. That is the only absolute way to know 100% how much exactly is in it. However, you can tell if it is very close by the pressures, Read FRANKHALLMAN, he answered it perfectly. The low and high are a ratio and I think your system is way overcharged. You need to evacuate- with recovery machine, then make sure no leaks by making sure it holds a vacuum, then charging it with the exact amount either using a scale or the recovery machine depending on the machine.