Noticed when I turn the car off it drips slightly. I checked and saw coolant where the line goes into the overflow from the ast. Is this from a possible coolant seal being blown? Or just a leak in the connection

 

Dont see how a leaking coolant line would indicate an engine failure of some kind. Delete the ast and never worry about it again

 

No. The coolant seals live internally between the iron side plates and aluminum rotor housings. They’re the rough equivalent of head gaskets in a piston engine. Other than both containing coolant, one has nothing to do with the other.
That hose is thin-walled and is not pressurized like the rest of the system. It’s function is to allow coolant to expand into the overflow as it’s heated-up and to allow coolant to be drawn out by natural vacuum when the engine is shut off and cools. It needs to seal though, so that vacuum isn’t lost. If there’s enough length left in the hose, try simply clipping it off evenly and cleanly and reattaching. Replace any lost. coolant in the overflow afterward until it’s full-cold on the dipstick.

 

You can use 6mm silicone vacuum hose for that line. Even if you eliminate the AST you still have to have that line.

There should be little to no coolant in that line when the car is cold. Remove, replace with new, and make sure the coolant level in the engine and on the dipstick on the overflow tank is right where it should be. Hopefully that's it.

Stock the line has a plastic connector in-line about 5 inches from the overflow tank, it's just there to make it easier to put the car together at the factory. You can run new hose all the way from the overflow to the nipple, use that plastic in-line connector, whatever.

Dale

 

there's a learning opportunity here to learn how to pressure test your cooling system and find other leaky spots proactively. the local auto parts store 'rents' what they call a radiator or coolant system pressure tester. Check out some videos on how to use those.