Why don't your heater work?
There might be a bad fuse causing the heater to not work. Check the fuses if they are all ok you may have a bad blower motor. when you turn the heater on and no air is blowing then it is your blower motor.
Why dont my heater work in my 92 silverado the blower works great and heater core is hooked up but still no heat?
The heater core is probley stoped up. You can try this and it might work. Just switch the hose's on the heater core and then go drive it and see if you get heat. Just be sure engine is COLD before you switch the hose's. If that don't fix your heat, Then PLEASE ask your question again. When you get back from driving it let it cool back off and then put the hose's back…
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.