u need a new blower
YES!
Check the fuses first and the blower relay.
When you find out let me know I have same problem replaced blower fan and resisitor did not work. I have a blazer zr2 2002
There are a number of reasons why your cruise wont work on a 1999 Ford Pu. Your wiring could be fried.
Check your radiator fan switch and your fan switch coolant sensor .
Blower motor control relay under dash behind blower motor is bad or has water in it from cabin filter port.
Could be,Blown fuse,Bad blower motor,Bad blower motor switch,Bad blower motor speed resistor,
Either the switch or resister network has failed and needs to be replaced.
did your heater switch go out all of a sudden or did some work like high work and low not work? if some worked your blower resister is most likely bad under your glove box
blown fuse
They told me 500$ when I went but you can do it yourself with atleast 6 hours of work