Find your fuse layout or owners manual and check the fuse and replace it even if it looks ok,thencheck to see if the switch itself is bad,if so replace it by removing the screws,(4-6) and dash cover checking the connection and switch,replace which ever one is bad and turn on the car,turn one the switch if nothing happens the switch is bad replace and enjoy!
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The blower motor speeds are ultimately controlled by the Blower Motor Resistor, when the Resistor becomes defective, current goes right thru it and the Blower Motor only operates at max. speed. Replacing the Resistor is a simple task. Locate electrical connector to blower motor, trace back wiring no more than 8" to next plug, The device where the plug is connected to is the Blower Motor Resistor, disconnect plug and remove the two screws, remove and replace Resistor.
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sometimes it can be a fuse but not always. there are three components that usually cause the blower to stop working. 1-fuse 2-blower motor regulator 3- blower motor. The blower motor and the blower motor regulator both sit in the same housing under the windshield beneath the cowl cover. The blower motor fuse should be a single strip fuse by itself near the left shock tower.
If you mean the blower stops, make sure you have access to the blower. Turn on heater when blower stops check to make sure it still has power which I think it will. This will tell you that the blower motor is going bad and shutting down when it is warmed up. To repair just replace the blower motor.