What year is your Z? I have an 09 and if you overfill the coolant, the pressure will force some coolant out of the overflow tank via a small hose. I believe the overflow was changed in later models though.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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