Can you come up with some sort of do-hickey to pressurize the cooling system without the engine running?
Then pressurize the system and look and SEE where it's leaking.....
I could rent a cooling system pressure tester again and see. The thing is, it only started leaking the first time after I took it on a road trip. Not before that.
When the motor got to 220° awhile back, it didn't leak. Which, the system would've been way pressurized then.
Sent from my PH-1 using Tapatalk