Your heater fan has a resistor/relay that has failed. It will need to be replaced. Look in the fuse panel to find the fuse for the Blower motor and remove it. That will stop the blower motor from running and killing your battery. The fuse panel cover should have a diagram of the fuses that will tell you which one it is. If the fuse diagram isn't on the panel cover, look for the fuse diagram in youe owners manual.
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