Most likely the turn signal flasher.
behind glovebox.
Passenger side behind the glovebox
1998
In the fuse/relay center under the hood.
under the hood in the juction box
If I am not mistaken it is next to the filters which are behind a panel in the rear of your glovebox,,,,,good luck
I had to do this on my 1997. You have to order the part. The blower is located behind the glovebox, just remove the glovebox and look up behind it and you should see it. I think three screws hold it in place. Keep track of which screws go where as there were quite a few when i did it.
1995 to 1998 S10 fuel pump relay is located in the glove compartment behind the door marked "relays". It is the first relay on the left.
The air door actuator on a 1998 GMC Jimmy is located in the dash. It is located behind the glove box.
IT IS BEHIND THE FUSE BLOCK IN THE VEH COMPARTMENT.
behind the glove box, some models require pulling the dash, some you can just remove the glovebox.
passanger side wall behind the glove box