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Honestly I think that Pontiac made the overflow reservoir too small. I have to add antifreeze to my GF's Grand Am once every couple months. If its a consistent problem where you're having to add antifreeze daily/weekly the car may be running too hot, and should probably be looked at by a mechanic.

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Q: Anitifreeze leaking out black overflow hose on firewall of 1998 Pontiac grand am what can this problem be?
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