Ford: 1993 f-150 blower motor, cabin air filters, cabin air filter

Question
I have a 1993 f-150, the fan does not come on for vent, defroster, heat or a/c. Is sounds like it is on but no air comes out of the vents. I checked the 30amp fuse on the fuse box and it is OK.

Answer
hello.

If the fan comes on at all speeds, but doent push air through any vent, there is most likely a blockage in the air system. Either the Cabin air filters (if equipped), the heater core (debris from trees etc.) or A/C evaporator ( some sytems flow through this all the time)

Check and see if you have a cabin air filter. Some higher end models do and it can plug up in months.  Otherwise, remove the fam and look inside to see if leaves and debris are pluggeing the heater core.

Another possibility is if the fan was replaced and wired incorrectly. sucking instead of blowing.