I recently purchased a 2017 Sierra, suddenly the AC stopped blowing cold. I went to check the refrigerant level when I realized the radiator fans are not turning on. I I disconnected the Coolant sensor and the fans will come on as expected. all fuses and relays test good. I replaced the Coolant Sensor just for piece of mind since I just purchased the truck but it made no difference. also the temp on the gauge will not go above 210 even though the fans are not turning on (not sure I believe the gauge).
If anyone else has had this issue, I could sure use some help on where to check next. Thanks