Interestingly, I just made my first longish trip to a remote job, and when I opened the trunk the cap was hissing and gurgling, and steam dropping from all over the deck lid.
It's running cool, and no puddles, but I wonder if the
new cap has gone bad? It's as tight as I can get it. I alerted my shop, who is ready to come get me with his enclosed trailer if it looks bad.
This has been an...... Interesting week.
Updates to come I'm sure.
PS: no, I don't believe I changed the coolant with the new cap last year. But it had recently been flushed and serviced at the time.