Front blower/defroster stopped working
 

Hope someone can point me in the right direction here, the 2001 Cougar heater is working fine blowing air at the various levels correctly and in the different setting selections correctly with one exception, the windshield.
Vents, floor, sides all getting plenty of heat but the frozen windshield is a little tough to see through...
I looked at fuse 42 and it seemed good, any other suggestions??

Thanks!