Leaking anti freeze under thermostat on 95 buick century

SOURCE: horn relay 95 Buick century

It is located in the convenience center to the left of the steering column.

SOURCE: 1996 buick roadmaster keeps overheating:

A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

SOURCE: 1999 Buick Century thermostat question.

patience , and a 13 MM wrench , you gotta get your arms in there deep , that lower bolt does not need to come all the way off , the thermostat housing has a slot at the bottom for easier access , loosen it about 3.4 of the way and you can get the housing out , experience says a premium thermostat will give you grief trying to reinstall , get a regular duty thermostat .reverse procedure.

SOURCE: How to change anti-freeze(coolant) on 2003 buick

Hello, perform the following steps in this order:
NOTE: car should be cool, in park and on non sloped surface.
NEVER leave used coolant in an area where children or pets can gain access, Anti freeze has ethylene glycol which can be lethal to humans and pets. Used coolant should be immediately taken in a sealed container to a local state certified recycler for proper disposal.
1.Raise front end of car, and place one jack stand under frame of car on the inside of each front wheel.
2.Place a 2 gallon (low profile) bucket under the radiator drain plug. The drain plug will be located at the bottom of the radiator.
3.Unscrew the drain plug and let coolant drain into bucket. (It may be necessary to adjust bucket so no coolant leaks onto the ground.
4.After all coolant has drained from the radiator, tighten radiator drain plug finger tight, then 1/8-1/4 of a turn with a wrench.
5.Unscrew radiator cap and begin filling radiator using 50/50
premixed antifreeze solution.
6.Continue adding premixed solution until fluid is just below the top lip of radiator where cap fastens to.
7.Re attach radiator cap and lock into place.
8.Check radiator overflow reservoir and ensure coolant is between add and full, add coolant as required.
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SOURCE: how to change a thermostat on a 95 buick century

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