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Was the one of those carwashes with a wand and if so, did you pop the hood and clean under the hood with the power wash wand?
Ok, does the front blow out the bottom ok?
Does this have the 4.2 or 4.4 engine and is this a sport or not?
This has both a rear blower motor and a front blower motor. I don't see them related only in that they both share a couple of fuses, namely the fuses 34 and 12 in the cjb, so it must be something only for the front blower motor and that is powered from a front blower motor control unit and before that a maxi fuse #64, a 50 amp fuse hot all the time in the central junction box, so let's test both sides of that fuse first for voltage with a voltmeter or 12 volt test light.
Then if the fuse tests ok, will can move into testing the front blower motor for voltage and retrieving any codes from that front blower control module, automatic temperature control module, the bcm or whatever modules may store codes for that system.
Just in case, here is the wiring diagram,
Call them up and ask them, if not purchase a $4 12 volt test light or multi-meter and I'll show you how.