Try unplugging your AC compressor and see if it still blows the fuse. When you turn on your defrosters you also turn on your AC.
Could be a vacuum leak "defrost" is the default position of the system Check vacuum lines and motors under the dash
Faulty Function selector switch. Consider replacement.
Check for a vacuum leak either under hood or under dash Check the operation of the vacuum actuators under dash Check the operation of the selector switch Defrost is the default settting for this system
How do you replace a defrost blower motor in a 2003 Toyota Corolla
No, the rear defrost is just an electric grid on the rear window. No air movement involved.
hoe to replace blower motter on 97 ford countour
Check for a blown fuse. If fuse is good remove blower and check for power at the blower motor plug using a multimeter or voltage tester. If power is available replace the blower motor. If power is not available you can do a running check by directly hooking up a 12 vdc power supply to the blower to see if it will even run. If the blower runs, your problem is your most likely the fan speed control resistor which will need to be replaced or repaired.
Could be, Blown fuse, Bad blower motor, Bad blower motor speed resistor, Bad blower switch,
blower motor resistor is burned out
You need to change the blower resistor, located behind glove box.
figured it out! now i have heat.
If by quit working you mean quit blowing, the things to troubleshoot are the blower motor, the blower motor resistor switch, or the blower motor speed selector switch. If by quit working you mean it only blows cold or warm air, the thermostat is probably stuck in the open position.