There are several possible causes, only a pressure test of the system will tell. The GM V6 had some issues with intake manifold sealing, and there have been at least 3 different gasket designs that I am aware of.
My car is is running hot and smoking... i discovered the coolant was low i added new coolant and its pouring out the bottom of my car My car is is running hot and smoking... i discovered the coolant was low i added new coolant and its pouring out the bottom of my car
Assuming you mean engine coolant is pouring into the oil pan, you probably have a blown head gasket or a cracked head or a bad intake manifold gasket. To answer that question in more detail the year, make and engine information would be helpful.
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You will see coolant pouring from it and your car will overheat
are you sure it is coolant? is the elbow located on the firewall? if that's the case then it's not coolant, it's condensation from the AC doing what it is supposed to do.
If you are pouring it directly into the plastic antifreeze reservoir, it most likely has a crack in it.
damaged or faulty radiator If coolant is "pouring" out of the radiator with no damage evident, could be stuck thermostat, especially if it happens soon after starting car. Could also be blown head gasket if pouring out of the fill tube with cap off.
Heater box drain It is just below the heater hose conections, If the heater core leaks it drains the coolant outside to keep the carpet dry.
either a cracked radiator or a ruptured hose, are you pouring it directly into the radiator or the resivoir?
Flush all coolant from system by loosening lower rad hose (when cool) and catching all fluid with a bucket. Use a garden hose to flush radiator from upper cap. When drained and flushed fill with 50/50 coolant/water.
could be that your intake manifold is cracked and leaking from the intake, try using small dental mirrors to locate the leak in hard to see spots.
i would check the freeze plugs on both sides of the side of the engine block.