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ther are a number of freeze plugs on that motor , if I remember there are 2 on each side and 2 in the front , pressure test it , you should find your leak then are you sure it is coming from the water pump the water goosneck is right on top of the manifold in the front , those are the only 2 things that can leak unless it is a head gasket on the outside which will not affect anything ,very rare but I have seen it , no hole in the heater hose or bad clamp crack somewhere , pressure test it, you should find it then good luck
Check your intake, sometimes water runs thru the intake to cool it down and it can crack on the inside. When this happens it will send water to cylinders where it is burned. Also, any leaks at the water pump?
the pressure regulator may be leaking. pull he vac line and see if its wet. wet is bad. Also these fuel pump connectors are known to overheat from poor connections. Do a search on gm fuel pump repeat failures and overheating connectors. Also the fuel pump could be leaking down so the line needs to be primed. Try cycling the key about 3 to 5 times before you start it. The pump will prime for 3 seconds each time before shutting off. If this helps the problem is the fuel pump.
your going to have to isolate the location of the leak. if its coming from the water pump than your water pump is going out. also check around the radiator and make sure its not leaking around one of the hoses.
It is the water pump most likely,they have ,what they call a weep hole in the bottom under the pulley,so they will leak out to let you know to change them right away.If it is on the top coming from the intake area,it would be the intake,they are also bad to leak,but look at the pump,under the pulley.
When they changed the water pump and the leak stopped then the water pump was bad. If they changed the water pump and was still leaking then then it was not the water pump.
Where is the fluid leaking from, if there is white smoke coming from the tail pipe then good chance is that the head gasket is gone and pull the dip stick out to see if there is antifreeze mixxing with the engine oil.
It's common that the 3.4 V6 has intake manifold gasket go bad and leak. Check all the heater hose first, and try to find out where the leak is coming from.
Good luck and keep me posted, glad to help you as much as i can.