I'm having this exact issue and am taking it in to the dealership to have it looked at. It will blow hot if I'm waiting at an on-ramp light, when I accelerate, or if I leave it sit for a few minutes. It takes me five minutes fighting with it until it starts working again. Yesterday was over 110 and it was a nightmare. My oil temps stabilized at about 190-195 driving around and would get to about 215-220 idling. Water "dots" didn't move. I didn't feel like pulling out Cipher to log the exact temps. It is occurring more often when it's warmer.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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