Air pump, yes you have one. It is located above the alternator on your left hand side if you are standing in front of the car looking into the engine compartment.

This happened to me one morning while on an out of state trip. Pulled into a gas station after a 4 hour interstate run. Filled up. Upon start up a horrible screeching grinding noise began. It was easy to diagnose. Simply take a long handled screw driver and grip it with your thumb over the handle end.
Place your bent thumb joint to your ear and touch the blade to the air pump.
You will hear the noise if that's the problem. You can also pickup a cheap stethoscope at MacParts.

The good news is that the air pump is designed to only run on cold start up.
Trace the wire to the connector and disconnect. That disables the clutch and the pump should not turn.

Replacement rebuilt pumps are 500 bucks ish.

Steve