Cant figure out how to change the thermostat on my 2003 Olds Alero.

1. (This is for a 2.2L engine) If equipped with an automatic transmission, remove the exhaust manifold.
2. Drain the cooling system.
3. Remove the thermostat housing to water pump feed pipe bolts.
4. Remove the thermostat housing to water pump feed pipe.
5. Remove the thermostat.

After replacing the thermostat my 2003 olds alero still over heated and they determined my water pump would pump some then stop and sporatic like that causing the over heating ... water pump being replaced will have it back tomorrow and will let ya know what happens