I arrived to perform a diagnostic on an air conditioner. Upon inspection, I found thermostat off. Homeowner had complaint that blower stopped about a week ago. He replaced both blower and dual capacitors on system and it was then functioning fine. After 24 hours blower stopped again. Checked blower wheel - clean and clear. Bearings are gritty and make noise by spinning free handed.Checked blower capacitor rated for 5 mfds., actual reading 4.88 mfds. Within spec Checked blower amps - 6.88 amps within spec but very noisy and paddling water. Can see where the oil from the sealed bearings from back side motor. Quoted repair. Advised to leave furnace off, homeowner turned the breaker off to furnace Based on age (24 years old), lack of efficiency, cost of seen and future unseen repairs I recommend replacement of furnace.