1998 F-150 fuse location
 

Have 1998 F-150 need to know what fuse and what location to replace fuses on the fuse panel. Heater will blow but no heat . Any help would be great

Just a hunch, but it doesn't sound like any fuse to me. Suggest you do a search here on FTE. These pickups are well known for a variety of heater problems. Yours sounds like either a PITA vacuum operated blend door failure or possibly the nefarious knob slipping on shaft issue.

thank you for your reply

Try switching the fan and temp knobs first and see if that fixes it.

Mine did the same thing.... the ole knob slipping on the shaft thing. Even though it felt tightly secured, it wasnt grabbing the shaft, and therefor no heat or adjustability.
Start simple, and then address the other complex issues.
Knob was 22 dollars from the dealer.