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Ok so I am stumped on this and spent to much money and my own time I am at my whits end. I have a 1999 Chevy Silverado 1500 4x4 5.3l v8 Single cab Short Wide It is over heating I have no clue why. This all started with a plastic nippe broke off my heater core since then it hasn't ran at normal temp. We first by passed it and just spliced the hoses together that didn't work then we got a new thermostat that didn't work next came the new water pump then all new hoses and a new plastic nipple for the heater core. I have flushed the block, radiator and the heater core everything was fine the water that came out was clean as could be ( Other than what LITTLE antifreeze was in the heater core) I have replaced the following Upper radiator hose Lower radiator hose The Y hose that come from the holding tank to the heater core and the water pump The one hose that connects directly from water pump to heater core. Went through 2 Thermostats both brand new one a cheap one and one a more expensive one different brand as well. New water pump and water pump gaskets I belive that is everything radiator is less than a year old had to replace that awhile back as the old one cracked So to recap i have replaced all this and it still over heats I've tried filling up everything first and running it the holding tank just fills and doesn't seem to want to let anything pass the thermo stat all the hoses get hot the lower one is bairly warm and the hoses to the heater core don't get very hot either. As a side not i did notice when i turn my defroster on or my heater or even the ac *My ac has no belt so it just blows air* But my truck ( I assume the blower fan ) makes an insane rattling and vibrating noise coming from the dash and i can't get hot hair to blow out of my truck either. Also truck has 270k miles on it if you need more info ask If anyone knows how to fix this i am in dire need please and thank you.