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Not a major task on your Cutlass...trace the upper radiator hose to the top of the motor...(intake manifold) you will find the thermostat inside the housing connection...held down by 2 10mm bolts...your replacement should be rated at 195 degrees...(usually the only one available for your V-6...Be sure to inspect your hoses for wear...you will lose (spill) some anti-freeze while removing the thermostat housing...I also recommend to buy a housing gasket as well as the inside gasket seal...these do not always come with the thermostat...Also use gasket sealant as no leaks are attainable...:) Have some anti-freeze handy to top off your overflow system after the installation is complete...you need to inspect while idling to be sure no leaks, and correct amount of anti-freeze in your overflow...2 measures are engine cold...and engine hot...Hope this helps...:)
The coolant sensor liight come on when the Anti-freeze get low. Just top off the ant-freeze and the light will go out. It is norrmal for anti-freeze level to go down but slow. Toping off once or twice a year is ok but anymore then that you really should check for leaks. Low anti-freeze will cause over heating. Over heating can wreak an engine.
Without knowing what year or engine size is, I/m just guessing??????? But the 3.1L engines are FAMOUS for intake maniflod gaskets leaking. Look where the intake bolts to the heads. A freeze plug is in the block. Freeze plugs dont leak unless you have been running pure water or weak/cheap anti-freeze. They will rust out from behind and its BIG BUCKS to replace them all.
And you are sure it is Anti Freeze that is leaking or is it water condensation dripping down from your air conditioning? And yes it could be coming from the backside of the engine on top from the intake manifold or up towards the top of the firewall near the two hoses going into your Heater core.
I have seen a couple of these now with headgasket leaks to the outside of the block just as you describe. I solved them both with a stop-leak additive, not something I would normally use, but I really didn't want to pull the heads because the exhaust studs always break on these engines. I would find out for sure where the leak is before proceeding though. If it's a hose or frost plug, you'll have to repair it properly.
If it's leaking at the top of the engine down. Look at the top of the engine at the front and you'll see a bleeder valve on top a black housing. These housings like to come apart at the glued seams. If it's leaking at the lower part of the engine towards the front, it could be your water pump leaking. Check your oil and if you see the color of the oil looking like chocolate milk, your water pump needs replaced, the oil will need changing as well. Do a coolant system pressure test and see if your hoses somewhere are leaking. Also check for your surge tank leaking. This is the tank that you put coolant into.