I have a 2002 Pontiac Montana with 3.4 l engine. I have to top up the radiator bottle about twice a year with coolant. The motor has about 157, 000km now but when I purchased it had around 70,000km. I had to add since day one and it never got any better or worse. I don't see any that has leaked on the ground or around the engine. So where is going and I guess it is leaking and getting burned off.
Any thoughts.
Jeff