In Cave Creek, AZ: DIAGNOSTIC- Upon arrival, spoke with customer. Unit appears low on charge. Charge was at 52/156 psig upon arrival. Customer said he had charge right, but compressor would overheat. Filled system with customer supplied R-22 Freon. After adding .3lbs of charge, found compressor not working properly. Charge went up to 100/200 with just a little Freon. Compressor then overheated. Recommend replacing system or compressor. Service complete.