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Blower fan was howling for several months...then stopped working completely...I

(2003 Mercedes-Benz S430 4MATIC)
in Lagrange, OH on August 15, 2011
I found water build up in intake at firewall...unplugged leaves detrius from the drain...hose vent at bottom...fan and ac worked fine for one day...stopped howling... worked 24 hrs after my cleaning out the drain...water was dripping onto passenger side floor prior to my finding the water build up...How do I replace fan and motor and relay? I cant get the fan to blow or howl now...air was coming into the compartement when the fan was howling...Now nothing
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