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I had a 94 9c1 that had a bad air pump so I never dealt with one? my 96 has one that is all there, hooked up. Do they make some type of noise when working? Buzzing or humming noise? My car makes that type of noise near the pump.
 

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The air pump is used to add more oxygen to your exhaust just before the converters to help bring them up to temperature. They only run for a minute or so on startup and then are worthless. Most people take them off..

sorry for the late reply.
 

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It makes a high pitch whining noise.

You can usually hear it spin up about 3-5 seconds after the car starts up (cold).
 
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