Loosing coolant.

[tmc2006]

Have a 2006 Grand prix base with 146,000 miles on it. I seem to be loosing antifreeze. No leaks anywhere that i can tell. And it's not going out the tailpipe. None mixed with the oil. Anyone have any idea what could be causing this. Car is not overheating and is well. Engine isn't getting overly hot. Can't figure out what the hell is happening.

[SaukRapids]

LIMs done?

[Fivefingerdeathpunch]

If the gasket between the cylinder head and lower intake manifold is black, then it's likely to be the lower intake gaskets.

Slight chance you have a head gasket but those are the most rare failures.

[SaukRapids]

Also check the coolant elbows. Sometimes they can be sneaky little leakers (insert Comey joke here)

[buickman104]

Run a pressure test. If you plan on driving cars most of your life then it is a worthy $40 investment.

[tmc2006]

Thanks for the suggestions , Will check the elbows and perform a pressure test. Not sure if lim was changed, should have checked that before posting question duh, thanks again everyone.