Heater blower motor is defective and locked up, or possible short in the wiring.
for fuse to keep blowing, there is a short in the eletrical system somewhere. check the a/c switch and the a/c clutch
Sounds like it could be the ECM fuse. You need to have someone check it for a short.
i replaced the head unit and the fuse stoped blowing.
Low coolant and a clogged heater core are possibilities.
faulty control valve on heater or air in the lines
You need to change your thermostat in the car.
No...
The heater core is leaking coolant.
sounds like an electrical short. go to an auto electric shop for a proper diagnosis.
it is your heater core most likey
maybe because the heat is to high for the fuse to bear. You probably have it on all the time If it blows as soon as you turn it on, it is a dead short, pinched wire, bad blower motor. If it takes a while for it to blow, it is probably the blower motor going bad causing a strain and drawing more current than intended.
Yes you can but you are setting yourself up for a big problem. There is a reason the 20 amp fuse is blowing. By installing a bigger fuse it allows the current that is causing the 20 amp fuse to blow to stay in for a longer period of time. This can cause excessive heating and melting of the wires on the circuit that is blowing on a 20 amp fuse. Trace the wire and find the fault. Always use the manufacturer's recommended fuse sizing for your own protection.