The AC and heater are completely different subsystems.
The heater relies on heat generated by the engine and circulated by the engine coolant (radiator fluid) while the AC uses a belt driven compressor and separate fluids.
Their only normal commonalities are the blower motor (which you said works), the ducting and the control head.
The blower may simply have burned out. If the blower is out then the heater probably still works.
Your heater coil is bad.
First you have to see if your blower motor is working or not. If it is and still you have no heat then your heater-core is blocked and needs to be replaced.
Fuse- Blower Motor- Wiring- Selector switch fail- i8f you still have heat to the heater core, if the heater core is cold, and the mottr is still hot... change the thermostat
I have changed resistor a d blower motor still not working, maybe i missed a fuse or could the control switch not work?
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
Yes. Hot water comes from the water heater. The blower motor propels warm air around the house through the duct-work, but is not connected to the hot water heater in any way.
OK, did the blower motor actually just stop, or does it still blow but no heat?
Any of the following................... 1. Low coolant level. 2. Clogged heater core. 3. A/C heater controller bad. 4. A/C heater doors not working. 5. Vacuum problems........
probably the blower motor resistor
replace the blower motor resistor located on the passenger side under dash up in the corner.
You still have a blower resister assembly, wiring, and a blower motor itself, in that system. Any one of those could have a problem. You need to use a test light at the blower motor connector and see if you are getting both power and ground. If you are missing a ground, most likely you have a bad blower resister assembly. If you are mssing power, check fuses and wiring. If you have both power and ground, and the motor isn't working, you need a blower motor. I have also found that sometimes tapping with a screwdriver handle on the motor will make it come on, and if that is the case, then again, you have a bad blower motor.