Check the ground connections at both sides of the dash panel, also check the connection at the engine coolant temperature sensor. Use a scan tool to check what the ECT is actually reporting as the engine temperature.
If those check out it is possible you have a failing cluster. A good scan tool that can talk on the class 2 bus would show if this is the problem as errors on the network usually show up.
Wednesday, June 28th, 2017 AT 6:29 PM