Just a side note to "back in the day" I was working at a Ford dealership in1966 the year Ford started using A.I.R. pumps. Ford called them Thermactor pumps. We'ed get a new car in or one on warranty with a squeaking pump. The factory fix was to pour about half of a quart of transmission fluid down the pump inlet while the engine was running.The second time we did this we wisely put the car out at the back fence. Instant thick white smoke. Not a live mosquito within a five mile radius. Talk about air quality!