3.4 liter, you may have a bad water pump or at worst you have a bad intake manifold gasket which is a common failure to the 3.4 liter V6 engines. Start with the simple, flush out the cooling system and replace the thermostat. Inspect any signs of possible intake gasket failure and head gasket failure and replace. After that has been inspected, move on to a possible weak water pump and will need to be replaced. Good luck and hope this helps.
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