Most likely your blower motor resistor is bad. I replaced the resistor and the blower motor fan and it ended up being the speed control switch (alot easier to replace than the resisitor). Both the resistor and switch are around $19.
Switch problem? Cables disconnected?
it has a partially clogged heater core.replace the heater core
you need a new blower motor resistor
Because the resistor between the heater swithch and the heater motor is not functioning. Usually mounted on, in or near the heater enclosure. Its a common repair, and can be done by the do-it-yourselfer.
Your heater will blow cold air only.
probably the resistor pack on the evaporator case.
replace front heater corefront and rear have independent heater cores
you may not have the heater water hoses plugged in
Could be, low on coolant, stuck open thermostat, plugged up heater core, faulty temp blend door actuator,
The relay is bad.
thats it i think
heater will not blow on a 1996 ford contour