I just changed the blower motor in my 98 GMC ( the old one had been making a loud squealing noise). The new motor works as it should but it is so powerful that the outside air actuator flapps and makes noise on the 3rd. and 4th. speed settings. Does the dash have to be dropped out to replace it.

 

Never mind...My good friend U Tube solved the mystery.

 

So what was the mystery & fix?

 

Don't you just love when they do this ?

 

The "Mystery fix" is replace the danged part...and who are "they"?