Bulb in AC Controls
Not sure about the 2003 but in my 2000 you just pop off the trim around the radio/heater controls then take out four screws that hold the heater control in. Pull out the switch cluster and remove the bulb from the back. I think mine uses the small push in 194 bulb, it's been awhile since I changed it.
I usually take a small thin knife blade and work it behind the right upper corner and pop that out then work my fingers around it while pulling out the rest. Mine has 5 push-in connectors, yours may have more. Here's what mine looks like pulled out.
https://www.f150online.com/galleries...354&anum=14615
https://www.f150online.com/galleries...353&anum=14615
https://www.f150online.com/galleries...354&anum=14615
https://www.f150online.com/galleries...353&anum=14615


