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The switch kicks the RPM up when under heavy load, such as turning at idle, so that the engine doesn't stall. When it leaks it can allow p/s fluid to get into the PCM and O2 sensors.
I installed a reman cardone pump, I have power steering again but it has a constant low whine to it. Almost can't hear it, but it's still enough to get on your nerves considering it wasnt making any noises before.