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First check the fuse,if ok. Check if you still get power to the blower motor, on the plug, if so. you need to replace the blower motor and resistor. if not check power supply to blower switch,and power after the switch, if you turn switch on and off.
first check if the motor is bad.We ran a hot wire from hot to hot on battery.The fan kicked on.Ours was an inline fuse so ran wire from the positive wire on fan to a wire (hot) to key switch.This way you turn on the key and fan comes on
locate your blower motor.probably under dash rh side, possibly under hood fire wall area pass. side. unplug connector to blower motor.if older style with one wire check for source voltage present at wire, source voltage meaning voltage present at connector should equal batt. voltage.if connector has 2 wires place multimeter on DC volts across both terminals and reading should equal source with fan switch on high.
Check your fuses.If you have a test light, unplug the blower motor, start the car, turn the fan on, if you have power to the blower plug, the blower motor is bad. If no power, if it's not a fuse, check the blower motor resistor. Should be mounted right next to the blower motor. It is inserted into the evaporator box