Noises problem
1994 Buick Park Avenue 6 cyl Two Wheel Drive Automatic 78000 miles
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I have a 1994 Buick Park Ave. That I just picked up with 78k miles.

When everytime I shut off the motor some pump/?? located in the front of the engine (drivers side up close to the cab of the car under the hood) runs for about 2 solid minutes.

What is this pump/?? running for and it is actually pretty loud.

Should I be concenered?

Thanks