Engine Cooling problem
1992 Ford Explorer 6 cyl Two Wheel Drive Automatic 120000 miles
My truck temp gauge reads cooling while driving in normal condition but every time I stop at red light or slow flow of traffic it goes up to high very close to hot red light. Is it water pump? It dont show leaking. I had new radiator, fan clutch, and new thermot replaced. What can be the problem?
I would suspect either faulty engine coolant temp. Sensor or bad water pump. Double check to make sure coolant level is full and not leaking anywhere (hoses, radiator etc.). If OK here, inspect the drive belt around the water pump. Make sure it is not damaged or loose. Also listen to the pump with a mechanics stethoscope to see if the bearings are making any noises. If you are certain the temp. Gauge is reading correctly then I would suggest replacing the water pump.