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It is typical for the 3.4 liter motor to develop head gasket leaks. It usually shows up as a low coolant condition and then develops into a temperature problem. You should have it pressure tested to see if it is the radiator or the head gasket. Answer No it is not common for rads to leak. Most likely it is not the rad unless you have actually seen it. It is probably the intake gasket which will leak coolant. This is a very common problem on these vans.

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Q: Is it common for radiators to leak on a 2002 Pontiac Montana and how would you replace one?
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