EZ Auto channel    / @ezauto1911  

The 2017 Cadillac XT5 in this video had P0128 code for the check engine light, a steering assist reduced message, a coolant temperature gauge that constantly read cold, and an always-on high engine fan speed. The thermostat and coolant temperature sensor were then replaced. Problem solved.

Part I used in this video.
GM# 12678779 thermostat x 1
GM# 12648547 coolant air bleeder tube O-ring x 2
GM# 12648665 Intake manifold gasket x 6
GM# 12650595 Coolant temperature Sensor x 1

Disclaimer This video is for entertainment purposes only Please using personal protection equipment when you working on vehicle like safety glasses, and gloves If you are not comfortable working on your vehicle, please contact professional