I have a loud humm for about 30 seconds when the truck is started

Asked by Mar 18, 2016 at 12:52 PM about the 1999 Chevrolet S-10 2 Dr LS Standard Cab LB

Question type: General

When I start my 1999 S10 there is what looks like a pump that hums for about
30 second that is located below the radiator on the passenger side what is
this?

1 Answer

It was the secondary smog pump

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