89 pickup -- water pump or pwr steering pump?

How do I tell if the whiny noise from the front of the engine is the water pump or the power steering pump?

The power steering pump has a little bit of accumulated gunk on it, I assume from leaked fluid -- but -- fluid level in the reservoir is full and I only add a tiny amount once a year. Is it possible the pump is good but a gasket or seal is bad and I'm loosing enough pressure to make it whine? Steering is fine as far as I can tell.

No sign of leaks around the water pump.

Noise is not coming from the fan, valve train, engine, or transmission.

89 Nissan Hardbody pickup, 4x2, Z24i engine; 180,000 miles.

Cost to replace either water pump or power steering pump?

Thanks.

Reply to
Joe S.
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