The actuator pump for the 4 wheel drive on a 2002 tracker location

Directly behind the stock bumper. You can pull the bumper off or squeeze your hands up into where it's at. Should have two air lines and a connector that need to come off before you unbolt it.

My 4wd light flashes when I put in can you tell me what is wrong

I have a 04 Chevy tracker having a hard time locating the actuator pump that activates the four- wheel drive.

I'm looking for one. Can you help me?