My 98 sonoma high rider decided it doesn't want to engage its 4x4 for me anymore. When I hit the button I hear a click noise. Not sure what the click does but I don't think it's the hubs locking. I checked my actuator to see if it was functioning properly and it was. I hit the 4x4 button and had my buddy look under the car while I burned out on some ice and he said he didn't see the axle spinning. Does anybody know what could be wrong here? Is there a way to tell if my hubs are locking the front wheels? Help would be greatly appreciated because we just got dumped on with snow up here in northern minnesota!