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Old 06-10-2021, 01:51 PM
chrisfuture8 chrisfuture8 is offline
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Idler arm for power steering pump question

Hello All,

Am a little tight on time and unable to get under the vehicle to verify so was hoping someone could throw a quick answer if someone knows.

Which serpentine belt drives the power steering pump and in turns also drives the idler arm? Is it the: waterpump/alternator or the A/C compressor?

Reason I ask this specific question is because on cold start and sometimes warm too, the belt slips and especially when cold, when I turn the steering wheel, the belt screech. Belts were replaced a couple years back and only a few thousand miles on them now.

My hunch is the idler arm is not doing its job of maintaining tension and allowing the belt to slip especially under steering load.

Thanks in advance!

Chris
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1991 BMW 850ia

2002 BMW X5 4.4
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