Oh no, engine problem

[tjh]

Over the plug, like filling up the spark plug well? That WOULD be bad. How the heck would coolant get into the spark plug well?

Dude, I don't know.

That happened right before Moab 2011.
I put some bars stop leak in the rad and dielectric grease in the plug well. I drove it Approx. 10.5 months like that, and then replaced the motor.