Check your coolant level first, at the radiator, when the engine's cold, to be sure you're not low.
You may need to see a Chrysler specialist. Here's a directory link for you:
http://repairpal.com/chrysler-repair-in-sycamore-illinois
RepairPal Certified shops can diagnose and repair your 2005 Chrysler Town & Country. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.