Pontiac Montana 2002 leak

I have a Pontiac Montana 2002, which I had Gm look for leak on at 56,000 kms and tested, it was clean, yet I had to add coolant before the test. Now the van is at 65000 and again I have to add coolan. So,
GM Knows about the intake manifold leak. I have proof that the coolant was down and added before the warranty expired and now after expiration. Has anyone had a good experience with GM fixing this problem, at their cost? Jim.

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