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My 2000 alero is overheating it has 200,000+ miles and have changed thermostat six months ago and it fixed it for a while now it leaks water. What would be most logical choice to fix this before i go for waterpump?


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There is really no 'most logical choice' to go for as you should really fix what is wrong and not guess at parts. You say it leaking water, so where is the leak coming from? That would be the area to concentrate on.

If it is excessively overheating, you may have done some engine damage. When the engine gets really hot due to a condition like this, you can warp cylinder heads, blow head gaskets and cause a lot of other problems as well.

I'd recommend finding where the current leak is from and fix that first.
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Im sorry i should have included where it was leaking from it seems to be coming from the overflow on the resevoir?


   
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If the engine is overheating and pushing coolant out of the reservoir, then you have something adding pressure to the cooling system. Usually this is a blown head gasket.

If you see a constant stream of bubbles, or are unable to get the cooling system bled properly, that is often times the sign of compression being pumped into the cooling system due to a blown head gasket, cracked cylinder head, etc. This is a fairly common occurrence on the Alero's.

You might want to try a compression check or cylinder leak down test would be best if you are capable and have the right equipment. That would tell you right away if you have that kind of problem.
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