I have a buick century 2000 it runs fine for a couple
hours then the low coolant light comes on when i
check it it looks like all the water is being push out
the coolant bottle?
Sounds like a blown head gasket. You can get a DIY kit from your local parts store and just follow the directions on how to do the test, or have your favorite shop do it. Another indication could be white smoke out the tail pipe and or a slight engine misfire during initial start up, it goes away quickly.
Ok ill check it with a pressure tester
Also could be a stuck closed thermostat which pushes the water out first then causes it to overheat and is the less expensive way first
When you check it with a pressure tester you hook it up and then start the engine, the pressure should rise very quickly. If it doesn’t then you have other cooling system problems, radiator, thermostat, water pump, system restrictions.