The relay is bad.
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.
Probably your thermostat
The heater does not blow air because it emits infrared rays that have heat molecules within them, thus releasing heat, not blowing it. A heater does not blow air becasue there is no moving air source within the heater. The heater emits infrered rays that cause heat to slowly flow out of the heater.
Replace fuse #36 in the inside fusebox.See "Related Questions" below for more
Your heater will blow cold air only.
Defective blower motor?
Check the thermostat or heater core
why doesnt my heater work on my1985 BMW
For a Windstar, a common problem is a failed temperature blend door motor - actuator. See "Related Questions" below
either a bad fan switch or a bad blower motor. Take it to a trusted mechanic.