Taking the engine acoustic cover off should open up the engine bay somewhat for viewing if needed. Look at every coolant hose, trace them back from the reservoir.
Real oem has some nice diagrams as should newtis.info.

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03 3.0 Alpine/Blk (sold) Sport, Prem, CWP, PDC, Xenon
10 35d Titanium/Blk - Sport, Lux Seating, Prem, CWP, Tech, Rr Climate, CA