Well I installed the 79C thermostat last night. Went to unscrew the bleed port and threads came out! This was a junkyard housing I found a decade ago to replace the plastic one mine came with and I don’t think I’ve ever opened that screw!

Managed to find a slightly larger bolt that I screwed in right enough, but can’t bleed the air out yet. Drive this morning in 90F showed 82C max on freeway, however the drive home tonight should hopefully show improvement - I’ll report back.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k