Coolant level V6
I had a similar problem - turned out that the rubber hose that goes into the bottom of the expansion tank was rubbing on the air filter housing lip and had made a small hole. It is also worth checking the rubber hoses and metal tube that run along the bottom of front subframe as there is opportunity for some 'chaffage' there. In the end I just replaced the hoses.
Also - watch out if your coolant level drops too low as you may have to bleed the system when topping up otherwise you end up with air locks which just add to your misery
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