Hello all, I have an '05 1500, 3.7l engine. The temp guage usually reads right on the center mark in hot and cold weather, around town or on the highway. With the A/C on around town pointer reads 1/2 way between 1/2 and 3/4. But on the highway pointer quickly reaches top mark ( black line in what I would call normal range ) . Then it climbs toward the red, when warning on dash comes on saying check guages (duh), and stop engine. I've never let it overheat to the point of spewing coolant. Engine also stumbles when warnings come on. I've got new thermostat, bottom hose, and Mopar 5 yr coolant. Have not installed them yet pending complete diagnosis. Then I started thinking fan clutch might be going bad. Also NO coolant leaks.
Is there a way to check fan clutch? I appreciate any input .Thanks in advance.