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Q: Is it the water pump or more serious? on 2000 Oldsmobile Alero

I had a slow leak of antifreeze fluid but now when I pour the antifreeze in it runs straight through to the ground. I've been told it may be the waterpump and I've been told it may be a head gasket. My car thermastate raises but goes back down while driving. What's your opinion based on the facts given?
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Water pump leaks are very common for the 2000 Oldsmobile Alero with the 2.4L engine. It would be very uncommon for a head gasket leak to allow coolant to run "straight through" to the ground. If should not be difficult to find the cause of such a major leak. After the major leak has been corrected the system should be retested to see if there are any other smaller leaks.
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