1999 Chevrolet 2500 ,Vortec V8 5.7
Overheating, no leaks. Fan is working.
Good flow. Runs smooth. This model do not have a radiator cap only the resevoir.
by 
Django601
ANSWERS: 2
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A fan clutch or fan motor, depending on weather it is belt driven or electric motor driven, can cause overheating. Other possibilities are a bad water pump, internal plugging in the radiator, and a blown head gasket, but the latter will usually be accompanied with coolant loss without an apparent leak. A slipping automatic transmission can also cause it, so check the fluid for signs of burnt smell.
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Outside of Sweet T's already thorough answer a thermostat. They only cost a few dollars but the engine depends on it working properly. Easy fix if it is.
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