2000 Pontiac Grand Am Coolant Leak

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PORTERBOUND
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i have a2000 grand am gt. 112000 miles, there is coolant leaking from underneath the block, Directly under the the serpentein belt. I can see a bolt down there where fluid seems to be coming out of. Not sure what the purpose of bolt is. water pump is dry. No sign of coolant mixing with oil. It is a slow leak, it took me two weeks to find it. huge puddle on driveway after sitting all night. thanks[/b]
May 3, 2006 at 1:29 PM
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LOSONE
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You may have a bad water pump. It is driven by the cam chain if you have the quad 4 engine. let me know
May 4, 2006 at 10:16 AM
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PORTERBOUND
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[quote:e99d1f317a="losone"]You may have a bad water pump. It is driven by the cam chain if you have the quad 4 engine. let me know[/quote:e99d1f317a]


The water pump is bone dry!! Somebody said it may be the case surrounding the timeing chain is that possible?
May 4, 2006 at 1:37 PM
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LOSONE
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  • 1,616 POSTS
Internal water leaks are hard to trace. You should have the system pressure checked and see where most of the water if coming from. You may have to remove some sheet metal from the engine to find it. the majority (90%) of water leaks are rubber hose related. Let me know
May 5, 2006 at 10:19 AM
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Suggested Repair

Pressure-test the cooling system to locate the leak under the block near the serpentine belt. Inspect rubber hoses first, and check the water pump and timing-chain cover area if the test indicates an internal or cover leak. Sheet metal may need to be removed to trace the source.

Conversation Summary

The owner of a 2000 Grand Am GT reports a slow coolant leak from beneath the engine block, directly under the serpentine belt near a bolt. The water pump appears dry, oil shows no coolant contamination, and a large puddle forms overnight. The expert first suggested a possible water pump issue on a Quad 4 engine, then recommended a cooling-system pressure test and inspection, noting that most leaks are hose-related and some sheet metal may need removal to trace the source.

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