Need help here...I got a recent problem on a 3.4L...coolant leaking by bottle overflow...and engine is overheating...Thermostat is good (bran new) and water pump is turning...Engine start to overheat after 5 min....and temp gage show 90 celcius...that car drvie me crazy!!! LOL

Make sure the engine does not have an air lock. If you just changed the thermostat you may have not gotten all the air out of the system and that is causing the car to overheat.

No air in system...that's the problem...The water going every where in the system...no air...there is some air going in by somewhere in the Intake??? don't no...i've try everything

It sounds like you have a blockage somewhere, and that the coolant can't circulate properly. A flush / fill might solve it.

mine did the same thing, i needed a new head gasket, almost a grand later my cars fine...