Because the car is turned off and normally after going up this particular driveway the fan runs for a few minutes but it is not running. The clicking sound has not happened after normal in town driving.

I can hear it clicking like it wants to run but it isn't running. It's only in these very specific instances like going up a very long very steep driveway (I live in the mountains) or driving to a ridgeline to go hiking. I'll look into the monitor though that sounds super useful.

So in December '23 my engine died and now 6 months later it has a new engine and everything has been running great. Usually if I drive up long steep driveways or have large climbs to trail heads in the national park and then park, the radiator fan would stay on for a few minutes to cool the system. ...

When my xc70 had weird surging it was caused by a combo of a bad/dirty MAF and my engine air intake box not sealing correctly.