In response to fivefingerdeathpunch, I just ran it for a drive and let it idle. Lowest it was after heating up was 216 F, highest it got was 228 F.

I will try that. The shop bled it yesterday when I picked it up right in front of me for a half hour had bubbles coming up in a no spill funnel, and it still shot up the next morning, so I'm wary of that helping but I may as well give it a try.