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Did you already replace the heater blower resistor? I only paid 30 bucks for a replacement at Cut Rate Auto Parts. Mine was rusted and broken.
the heater blower resistor is located on the passenger side footwell near the firewall. a complete how-to replace the resistor, along with photos is available on newcougar.org http://www.newcougar.org/forums/how-tos/3732-fixing-heater-blower-resistor-install-photos.html
Most likely a bad heater core
have you checked the fuse if so then you will need to replace the resistor for the blower hig and low dettings have you checked the fuse do you have 12 volts to blower if so then you will need to replace the resistor for the blower replace the blower motor
A bad heater blower motor resistor would effect one or more blower speeds other than high.
Continental/VDO New A/C Heater Blower Motor PM4820
Open the glove compartment and remove it. Disconnect the electrical connector and the three mounting screws. Remove motor.
Remove the wiring harness to the heater blower fan. Remove the retaining bolts. Remove the fan from the blower. Reverse the process to install the new heater blower fan.
In the Power Distribution Box in the engine compartment ( Ford recommends disconnecting the battery before servicing anything in the PD BOX ) Fuse # 9 is a red color 50 amp maxi-fuse for the blower motor and blower motor relay
replace heater relay and or heater blower motor
you would have to see a mechanic about that problem
How much will it cost me to replace the heater core in my 1999 Mercury