Your thermostat is the likely culprit here it is probably stuck closed. Have it checked out.
Low coolant in the system. Defective heater control valve. Clogged heater core.
The heater valve could be failing to open for one reason or another.
get a new heater switch
OK, did the blower motor actually just stop, or does it still blow but no heat?
Leak in heater core. Replace core.
underneath the dashboard on the passenger side.
check your coolant level
The front expansion valve is clogged.
heater core possibly plugged and leaking
It doesn't really blow it out it just warms the cold air.
heater will not blow on a 1996 ford contour
if the heater does not blow out warm air change the setting.