You might want to check the alternator/pwr steering idler pulley

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Last week I had to have the car flatbedded back to CT from NYC (good thing I have AAA plus). The idler pulley for the power steering and alternator belt had frozen up, which of course wore through the belt and there you go. It was very cold and at night, so the already weak battery drained and the car was really hard to steer.

Long story short, it might be a good idea to check and see if the pulley is still able to spin freely. New ones are available from Mother Subaru for about $50.