Hoping to get some suggestions for troubleshooting.
Recently had a P0599 code and noticed my radiator fan had stopped working because the ground cable wire from the fan had come off the bolt. Found a 6m x1 hex flange nut to secure ground cable and fan started working normally again. Code went away for about a day and a half, then came back after driving around. Yet AC is still blowing cold, radiator fan is running, coolant and engine temp gauge is normal.
Anything else I should check?
I'm suspecting one of the sensors or a possible airlock in cooling system?