Something must not have went back together correctly when replacing the heater core. Looks like someone has to do the job over again.
blower motors bad check fuse bore replacing
Did you chech the fuse?
check for a blown fuse that says heater or blower motor
Heater blower motor is defective and locked up, or possible short in the wiring.
The fan motor has a short...change it.
You should check the thermostat and the fuse for the heater.
If the heater fan is not blowing on a 2001 Chevy S10 Pickup, it is possible that the fuse needs replacing. It is also possible that debris is interfering with the operation of the fan. Could also be, a faulty fan motor, a faulty fan motor speed resistor, a faulty fan motor switch,
Fuse, switch, speed resistor or motor.
You have a short somewhere in that circuit if the fuse blows soon after replacing it check the condition of the wires in that circuit
either the fuse that was put has too much wattage or not enough
there is a short somewhere in dash or heater, you need to fix that to stop fuses blowing
Blown fuse, defective blower motor, or defective blower motor resistor pack.
Defective blower motor? See if it is sgetting power Blown fuse?
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.
no fuse check your anti-freeze level
You need to stop replacing the fuse and find out why it is blowing. It is blowing because you either have a short in the wiring, too small of a fuse, or the circuit is overloaded. If you remove the fuse then there is no danger of it catching on fire. Just make sure you do not install a larger fuse than is recommended.
mor vehicle info would help, but blower motor can be shot without blowing fuse
Fix the fault blowing the fuse.
The heater fuse for a 1993 Geo Tracker is located in the fuse box that is inside the engine compartment on top of the battery. It would also be a good idea to check the wires on the heater relay that is on the passenger side of the engine compartment on the fender wall. It is just behind the washer fluid receptacle.
There's a short in your main line going to your fuel heater.
15amp fuse is required if it keeps blowing the fuse than you have a direct short in the circuit Do not put a bigger fuse than 15amp because it may result in a fire.
Which fuse is blowing? Yamaha XV250 Virago Manual Cyclepedia.com
It really needs to be checked out but it probably is the blower votor.