Sounds like either the shaft or bearings are shot. I just had to have one
replaced on my '95 (bearing was bad - caused belt squeal until the pump shut
down after a minute or two). Not cheap to have fixed (approx $800).
800$ is ridiculous. Try oiling the pump first, make sure the belt and
tensioner is proper and the belt is snug.
If the belt is proper and the oiling the pump doesn't help any, look
for another air pump in the bone yard.
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