I have a 1990 Chevy Cheyenne 4.3L V6 Truck and I have replaced the water pump, clutch fan, temperature sensor, thermostat, and radiator. My truck still overheats when I am sitting at a stop light, but not when I am driving it. My head gasket is good and I recently put a bigger radiator in it. What could be causing it to still over heat?
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