Today I filled up all the fluids and started my engine for the first time ( with fluids), its a brand new LS3 with a new Holly water pump. It climbed to 220 within five minutes, fans came on at 195 but the radiator and upper and lower hoses were cool. Put a gallon through the top radiator hose and ran again after it cooled off. Again got up up to 220 within 5 minutes. This time upper hose is hot but rad and lower hose are cool. There doesnt seem to be any circulation. Water pump is pretty simple and it is spinning. Only other thing I guess is the thermostat but if that is stuck closed shouldn't the lower hose also be hot since that is where the tstat is> Any thoughts? Anyone running the Holly serpentine systm with their waterpump?