My Quad Santa Fe had a squealing combustion blower so I bought a new one from a popular dealer and installed it. From day 1 it has randomly squealed just like the original that lasted 6 years without a peep. I've been told I can send it back and if it squeals when they bench test it(for an hour) then the warranty will be recognized. In the email I was told it sounded like either a bad bearing or incorrect installation. I've removed and re-installed the original several times without a problem. It's so random I'm afraid I'll be out the money if I send it back. I even sprung for 2 day shipping at 50 dollars because we were cold. I bought some 3 in 1 oil today but the bearings are sealed so not sure what good it will do. Any thoughts? What could have gone wrong with the install?