^ a coolant temp gauge? I'm saying you have at least a full cooling system replacement. If the expansion tank has failed then all the rest of the cooling system is not far behind. I hope that you did not overheat the motor until failure. Have a professional assess what has happened and move on from there. Good luck.

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2006 4.8iS Black/Black with custom Audison Voce/Image Dynamics sound
Production Date - 10/05