Where is the factory amp on a 1997 s10 blazer?
drivers side rear seat pull down and lift the panel should be under panel.
What is likely wrong with your 1997 Chevy s10 Blazer when all of a sudden air will only blow from the defroster at any position on the control unit?
This can be done, though some modifications may be needed. If you need to replace your core support (rad support) as well, order a core support for a 91 S10 blazer. This will help do away with the mounting issues. I did this to a 1985 S10 blazer and the grill fit fine with the factory core support, but not all of the mounting locations matched.