If the engine is getting up to normal temp, the heater core might be plugged. Heater core is not plugged and normal operating temp!
Bad bearing in blower motor?
FUSE!
The blower may simply have burned out. If the blower is out then the heater probably still works.
Check fuse if the blower is not working. If it is then replace your heater core. if its not then replace your fan switch.
fuse will be in fuse box. it will be labelled, either, heater fan or blower
blower motors bad check fuse bore replacing
Blown fuse, defective blower motor resistor pack, defective blower motor, a bad switch, or disconnected or loose wiring.
either the control head is bad or there is a blower motor resistor that is bad.
Could be, heater blower motor has failed. blower motor fuse is burned out. blower motor speed resistor is burned out. blower motor switch is bad. or, if the blower motor works but you have no heat it could be, cooling system is low on coolant. thermostat is stuck open. heater core is plugged. temp blend door actuator is faulty.
Those are two seperate circuits. Start with checking the fuses. There is a fuse for the radio and a fuse for the heater blower motor.
Check the A/C fuse, that's what happened on my '85.
could be the blower motor, a fuse, or a bad wire.