Dex Cool Antifreeze likes to eat seals and gaskets. My Guess! That the exhaust gasket is leaking on the back side of the engine.
It is a common and expensive problem GM products have.
You could try stop leak (NEVER DUMP THE WHOLE CONTAINER IN! It can plug the system up!) To use, when cool, open the radiator cap, and take a teaspoon full of the stop leak and put in ( run engine to full temp) and watch for a week (Did it slow down or stop?), if still leaking repeat the above. Barring this working, it is very pricey to replace that gasket. It worked for me.
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There is a small bypass hose that goes from the thermostat housing into the top of the water pump. You have to disassemble quite a few things to even get a look at it. It is a common problem and needs to be fixed as soon as possible. It is located directly above your timing belt and the antifreeze will cause your belt to degrade and fail, then you will be replacing bent valves.
The Most common leak on the 4.3 and 5.7 are from the Bypass Hose on TOP of the Intake Manifold. It is a Quick Disconnect Fitting that corrodes and then leaks and then drains down the back of the motor.
The next possibility is a Heater Hose
Depending on how bad the leak is... If you have been running Water or a Majority Water, the FREEZE PLUGS or EXPANSION PLUGS will corrode and the water eats the metal and BAM!!!! leak
If you can provide more information, but I would start there.
Start with the easy part. Are the heater hoses in good condition ? If there is nothing leaking from a hose can you possibly see if it is coming from the back of the engine? Could be several things maybe intake manifold gasket leaking, hopefully nothing as serious as a head gasket leaking externally, any check the easy stuff like the coolant temp switch and hoses etc. Good luck
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...:)
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.