2008 Mercury Mountaineer-power steering stops working when A/C on

jjr21jjr21 Member Posts: 2
edited July 2019 in Mercury
2008 Mercury Mountaineer v6 AWD, ~145k miles. It's been working okay lately, considering. Today, power steering pump stops turning when I turn the wheel while the A/C is on. Steering is normal with A/C off Guessing the compressor is slacking the serpentine belt upstream, although the belt tension looks okay. Replaced serpentine recently. No unusual noises. Tensioner failure? Pump failure? Any other explanations?
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