Not necessarily have system pressure tested to determine the source of the leak
head gaskets gone.
I'm assuming your grand am has a 3400 v6 which are known for intake and head gaskets leaking. so its possible that one of those gaskets are leaking so bad that coolant is leaking from intake/heads down onto your valvetrain and then down into your oil pan. more than likely its your intake gaskets leaking.
Can be leaking intake manifold gaskets, which can sometimes be fixed by using Dexcool coolant. Can also be a head gasket.
No It would not unless beside that plenum on your block is a crack in your heads and your leaking coolant or even leaking internally check head gaskets
Because it's leaking somewhere. Other than lines in the cooling system, head and intake manifold gaskets are a possibility.
Yes, a test strip is available that determines whether there is carbon monoxide in the coolant. If a headgasket is leaking the carbon monoxide from the combustion process will build up in the coolant. That simple test will determine if the head gasket is leaking.
Bad head gaskets leaking coolant into comustion chambers, reason for no visible leaks. common problem on diesel engines all over the world.
Sometimes, when head gaskets go bad, the coolant will be burnt off out of the exhaust system. That may not be noticeable at all.
Head gaskets do not go bad on these. You need to replace the plastic upper intake manifold as it is leaking coolant into the combustion chamber. Common problem for this engine.
The head gasket sits between the head and the engine block if it is leaking out where you can see the coolant, yes you can smell the coolant if it is leaking into the engine no you cannot smell the coolant. You can check the oil to see if it has coolant in the oil if it does then the head gasket might be blown.
Only when they are bad.
You need a head gasket.