How to replace the thermostat on a 2003 Buick century

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If there is a bleed valve near the upper radiator hose, you can use that.
If not, you would have to run the engine with the cap loose until the thermostat opens to let the air escape.

How do I replace the motor mounts on a 2003 Buick Century.And how many is there on the motor and transmission.And where are they located at I know there are to on top and are there to on the side of the motor as well.Well thank you for your time.

You can find the procedure to reset the light here

https://resetoillight.com/buick/oil-change-light-reset-buick-century-1994-1995-1996-1997-1998-1999-2000-2001-2002-2003-2004/

Change the thermostat under the intake horn.

follow your top radiator hose to top of the engine, where it hooks up with a hose clamp. under that metal housing is your thermostat! usually 2 or 3 bolts you remove , then lift off the metal housing and take out your old thermostat and remove the old gasket with a razor blade.. install your new thermostat and gasket and away you go!! richie

i would think your engine coolant thermostat is stuck open or faulty and needs to be replaced, inexpensive.

open the trunk and unscrew the plastic nuts on the back side of the light assy and replace

Fllow top radiator hose from radiator to engine, where hose clamps on engine is called a goose neck thermostat is under that, it will be held on with 2 bolts. are you sure you got all the air out of system when you chg. water pump? If you don't bleed all air out of system it will not blow hot, because of an air pocket in cooling system.