Noticed this same EXACT behavior as well. I also came to the conclusion that it was the GP's shutting down that started the noises.

I haven't thought about trying it for some reason, but this should be able to be confirmed by starting the car while the engine is fully up to temp. If this behavior is gone, then our theory should be confirmed, n'est pas?

__________________
Chris
1985 300SD - 'Grace' (198K mi.)
2018 Honda Civic Sport
2018 Honda CRV LX
2010 Honda Fit Sport (RIP)
2013 Honda Accord Sport (Sold)
1996 Lexus LS400 (Retired)
1995 Ford Contour SE (Retired)
1976 Porsche 914 (Sold)
1972 Datsun 240Z (RIP)