How do you install a block heater on a 1999 Subaru Outback?

To install a block heater on a 1999 Subaru Outback, first ensure the engine is cool and disconnect the battery. Locate the engine block's freeze plug, usually found on the side of the engine, and remove it using a socket wrench. Then, insert the block heater into the hole, securing it properly, and connect the power cord to an electrical outlet. Finally, reconnect the battery and test the heater by plugging it in for a few hours before starting the vehicle.