I had the same issue recently, I changed the engine temp sensor & it was ok for a while then came back, I changed my 160 thermostat to 178 checked coolant level & drove for less than an hour & it came back  temperature here is 45C+ & my chiller is not doing its job with this issue .
Any other thing need to be done ?
Ahmad
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2017 ZL1 A10 SW (SOLD)
Whipple 2.9 with 3.2 Pulley, Weapon-X Stage 3 Cam, FIICHILLER ,LG Motorsports LT, Borla S type, ROTFAB Big Gulp, Big 3 Reservoir
Glassskinz rear window valance .
2012 ZL1 A6 (SOLD)
Forged 376 CI, LSA HeartBeat, Mast Medium Bore Heads & JDP ZLR Cam, ARH LT , MagnaFlow Resonated X + Borla Atak Catback, ADM 102mm Snout, CAI, NW102MM TB, ID850, Fore Triple Fuel Pump, MSD Wire's, Moroso CC.
Alky Control, FIICHILLER.
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