hi just got a 98 lesabre and it has a strong anti freeze smell coming fro under the hood. theres no leaks anywhere that i can find. even took the engine cover of.
The best way to find a coolant leak is to pressure test it. This can be done with the use of a pressure tester or have your local shop do this for you.
The most common placed to look on the 3.8L engine is the plastic 90 degree tube located toward the top front of the engine. look for orange looking coolant laying around this area.