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There is an electric actuator on the front axle that engages 4WD. This part commonly fails resulting in no 4WD. Unhook the electrical connector to this part and see if heater still blows fuses. If It does not blow the fuse, the problem is in the actuator. If it still blows the fuse then it could be in the wiring. Buy a repair manual and trace the wiring schematics.
before you think it is your heater core try replacing your thermostat or flushing your system your heater core could be clogged feel the two hoses going into the heater core at the firewall they both should be hot
Run 12V directly to the motor and see if it will run, if it dosent than the motor is bad, if it does than the resister is bad, the resister makes the blower run and also regulates the speeds for the blower, but chanses are if it was making a high pitch squeel before it quit the motor went out.
when it doesnt come on next time, put it on high and give it a hit with your hand and see if it comes on. or test it for power at blower with test lite
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