The blower motor speed resistor is burned out.
The heater motor speed resister is burned out.
Possibly
Replace heater motor resistor.
Check the blower resister
If you are saying the Blower Motor only works on high, then your problem is a defective Blower Motor Resistor Pack. Replace it.
YOUR BLOWER RESISTER IS BAD
Replace the blower motor resistor.
Normally when a heater blower motor only works on the High setting, it is caused by a defective Blower Motor Resistor Pack. The fix is to, Replace it. In very rare instances it can also be a defective blower motor speed control switch, but rarely.
how is it my heater control on my ford fiesta flight 1998 only works on no. 4
ABS and blower motor are unrelated.To fix blower motor, read this:http://www.ricksfreeautorepairadvice.com/diagnostics/blower-only-works-on-high-speed
There is a resistor/ circuit board near the heater motor that need to be replaced. You can get one from almost any auto parts store.
Blower fan inoperative or only works on high speed.