hello all.i have a harman xxv.this is the 4th season since i purchased it new.2 months ago the distribution blower fan stopped working.(pretty upset it went after 4 seasons and naturally it was out of warranty)anyhow,i purchased a new one from my local harman dealer.i installed it and it was working fine until 2 weeks ago.then it started squealing and moaning and it stopped working.(so the replacement lasted 6 weeks)i removed it and returned it and the dealer said sometimes you just get a bad one.ok.i put the new one in and now 2 weeks later this one started a moaning noise and stopped working.i cant see it possible the original one went bad then 2 more in 8 weeks.the dealer has no idea.is there anything else that can cause these blowers to keep going bad?it is a simply install with 4 bolts,2 plugs and some wire ties.i cant see any way it can be improperly installed and it works fine for a few weeks.any help appreciated.and yes,i am buying genuine harman parts from a authorized dealer.