Please help, ACs are my arch enemy. I've studied the system in school but on cars they seem to get me in trouble. Problem: My 1998 Jeep Cherokee straight 6, AC worked all summer, I have added nothing. I have not touched it. This morning no AC. Clutch is not spinning. Fuse Good. Relay good. Put gauge on low pressure side and the needle pegged into the red. This is all I currently know. Thanks for the support.