2000 LS? Electric Fan?
WTF? Aftermarket?
Actuator is on the hydraulic pump for the stock hydraulic fan, which is mounted on the passenger side above the alternator. It's the only electrical connection going to the pump, so it's easy to see. Not easy to get to.
Probably a leak/pressure problem.
The first time I did a coolant flush, I got everything to work the first time.
The time I replaced a crap-ton of cooling parts, it overheated badly. I drained and refilled, and worked fine. Can only assume there was a significant air block that I didn't get out. Of course, it was 1AM, so could have been a lot of things.
Whatever is causing coolant on the ground should be found and fixed first.