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I'd be inclined to think if everything seems fine with the car's driveability, that the sounds are just contraction of cooling parts.
Newer cars have less coolant than before and rely heavily on the fan (this allows faster warm-up, and lower emissions), therefore when the engine is switched off, there is a lot of pent-up heat present. On some cars, the fan stays on after the engine is off to help reduce temps.
Also, different materials dissipate heat at different rates, hence why you get sounds created from movement.
This job should never be complete - the day I think I've done it all, is the day I resign.
Currently in VelSatisfied's garage:
2005 FIAT Ducato 2.8JTD LWB Gran Volume, 2000 Kawasaki ZZR 1100 D7 'fullpower' in black + full GIVI & KAPPA luggage, 2007 MB R-Class 320 CDi Sport LWB uprated by Brabus to 300Bhp don't know if there's a 155mph limiter - will be fun finding out! 2004 Mercedes Vaneo 1.7 CDi Ambiente 7-seater