I have a 1974 k5 blazer with a 3 year old crate 350. Its fan and belts have always made a little squeaking sound, but recently it has become worse and is accompanied by a sort of grindy, sandpapery, rough sound. It is coming from around the fan or belts or somewhere up in that area. Im unsure if i should even worry, or what i should do. The engine runs fine, im just unsure as to whether or not i should attempt to get it fixed or just understand thats what comes with a 28 year old truck.