If it's what I'm thinking you may be talking about - see if they put that on the resistor pack under the dash and behind the glove box. I seem to recall someone else having an issue with blower motor/switch/AC and it was an interesting fix. Maybe it will come to us.....
Member of the Dropped Valve Seat Club.
Replaced #4 Piston, Rings, Rod+Bearings, AERA Re-Manufactured Cylinder Head and a light Hone. Then CLEANED the hell out of everything.