How can I tell if the fan/clutch is no longer working? Would it spin all the time, or not spin the way it should? My car gets really warm in town but highway driving is fine. The cooling system is stock (new 180* t-stat, reman water pump less than 1000 miles). Theres pressure in the upper hose and the system has been checked for air bubbles. I dont think the heater core is clogged because the both hoses are warm when the cars been running. The car has a mild h/c/i but nothing crazy. Also when I turn my headlights on or parking lights the temp instantly goes up a bar or the "normal" gauge, even with the KOEO. But then if I shut the lights off it drops down again...Is that normal? I know stock gauges aren't great but why would the lights affect the temp gauge?