Question about 1991 Mercury Grand Marquis
After driving a while, there is a hum that comes from under the car hood. It's coming from the left hand side, near the front left tire. We ruled out bad bearings and might think its a failing power steering pump. We're just not 100% sure.
It stops when I put the car in park, and oddly enough the car revs up quickly and idles back down normally before the hum stops. The car has never stalled.
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Posted on Jan 02, 2017
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