89 sc compresser made load noise at very slow speed car would seem to die a bit . turned off ac switch, noise went away car seemed to stop wanting to die. checked to see if ac clutch would be able to be spun by hand no luck seems seizied. had it charged up two yrs ago,the gas, disconnected the plug on top of ac , and the fan does come on , so is this low on gas or comp just died of old age . thanx