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If it shuts off then comes back on later it's almost certainly the switch... but.

Never replace anything until you've checked it. Put a test light/meter on the heater motor then run it until the motor shuts off, then look at the meter. If the voltage is zero, or practically zero, it's the switch. If the voltage is up near normal (12.5 - 14) it's probably the motor.

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Q: What causes your car's heater to shut off by itself?
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