0 reading temperature gauge STILL after new thermostat and ECT

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Tilly2025

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2018 Yukon Denali had CEL and temp gauge read 0. Replaced the ECT and thermostat today, no change.

It’s been like this for a week. There iwas one day when it worked again before the new parts.

Bonus issues—getting a rumble strip feeling when accelerating around 1200 rpm. Have an appointment scheduled. Torque converter?
 

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