Over heat. What causes heat problems ? Thermostats , water pump , head gaskets , timing , loose fan belt , bent fan , radiator cores , radiator cap , Burned valves And worn pulleys.

To verify what your temp gauge tells you, check your coolant temp using a meat thermometer placed in the filler neck. If the gauge reads consistently high , or consistently low, replace the temperature sending unit.

Check your timing to specs.

You can tell if your water pump is working effectively by squeezing the upper hose after the thermostat opens. You will feel pressure and a current through it.

Radiator check ---Fill system and run the engine until the Thermo opens . You can tell when it opens because the water in the upper part of tank will start moving ,as you look see through the filler neck. If the water doesn't start moving after a few minutes, you have a faulty thermostat. Next-
CAREFULLY feel the front of the radiator with your hand. It should be hot at the top and cooler at the bottom, but with no cold spots anywhere. If you find cold spots, your radiator is clogged. Back- flush it and test again. IT IS CLOGGED.

Fans- Option Flexible ,6 Bladed, fiberglass fans can make a big difference to your cooling system's effectiveness, attach to the front of radiator. Put a sensor soldered to the top tank of radiator, when tank gets hot fan comes on. Be super on a long pull to 12,000 Ft. or slow moving traffic.

JW