Without knowing what model year the questioner is referring to...
Budget somewhere around $35-60 for a blower motor - likely to be closer to the lower end
See "Related Questions" below for more
Look behind the glove box. under dash.
A bad heater blower motor resistor would effect one or more blower speeds other than high.
maybe your blower motor relay is stuck or burned together ???
change the blower motor the bearings have gone bad in it
Your ac/heater blower motor may be going out, located below the glove box compartment.See "Related Questions" below for more about this easy do-it-yourself repair.
Remove the glove box. The front blower motor and the resistor can be accessed from there.
Sounds like the blower motor has seized up - time to replace it. See "Related Questions" below for replacement procedures
Yes, there is a fuse for the blower motor.
plugged heater core or bad blower motor or vent plugs
Depends on what you mean by heater will not work. If the blower motor will not work, it can be a blown fuse, bad blower motor, bad blower motor switch, or a defective blower motor resistor pack. If you mean that the blower motor works but there is no heat, then it can be a clogged heater core, thermostat stuck open, or defective heater control valve.
Remove the wiring harness from the back of your 2005 Chevy Cavalier heater blower motor. Remove the heater blower motor retaining bolts. Remove the heater blower fan.
The Mercury Cougar blower motor is located on the firewall in the engine compartment. The blower motor can be seen on the passenger side of the firewall.