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Waterpumps typically screech when they're going out, not whine. It's that distinctive "bearing going out" noise. Plus when they're in late stages, they also often weep.
If your rebuild only has 5K miles on it, it's likely still OK. The whine is probably the belts.
Did your car just start running hotter or has it always run at these temps?
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83 944 NA - Black on black
86 951 - Red - SOLD 7/21
16 Ford Expedition
He who hesitates is lost.
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