Recently picked up this car do not have it on the road yet just been tinkering around with it and checking it over and everything's good other than a small puncture in the ac line in front of the radiator (which I'm not concerned with) my main issue I'm not familiar with the v6 motor and have an issue with the coolant wanting to flow back into and fill the reservoir while just sitting idling. Any ideas?

 

Clogged radiator?

 

Ok. Thanks. Going to try and do a flush today and see if that solves it.

 

So did a flush today and still having same issue.

 

OK, next step is to start checking the cooling system components. Water pump comes to mind.....

 

Its a new water pump. Put on within the last 2,000 miles