Antifreeze leaking from under middle of van drivers side

The heater core is leaking, you'll need to replace it.

Could it be the water pump

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inspect your heater core

that water could be the condensation line,, if you have had your AC on, water will leak from along the firewall on the passenger side, where the tube runs out of the vehicle. Your radiator could have been low to begin with and when you saw the water leak,, you though that was it. check the puddle,, is it clear water or does it have antifreeze in it? If its clear water chances are , that its just the drip line from your AC, if it does contain antifreeze , check the 2 water hoses that run into the heater core , you can also see where they go into the cab portion of the van, from under the hood,

If it's a hose, it will leak fast, but don't count out other things like the radiator, water pump, head gasket, etc.

fill the system up with antifreeze and water or just water for diagnosis purposes, and use a pressure tester to force fluid out faster.

Maybe, if the leak is fast, you can look under the car to see exactly where it is coming from.

You say middle and opposite side of car (is this as you're sitting in the driver's seat?).

Where is the leak, now?

Depending on the location of the leak from under the van. With the van setting on level ground have someone to fill the transmission with fluid( do not overfill) look under van to see if the fluid is coming from the front or rear or middle of transmission. If you cannot look under the van then use a large piece of cardboard and slide it under the van before you try to fill it to locate the leak. leak could be front or rear seals leaking or the pan gasket leaking. hope this will help you.

check your heater hoses

either the sunroof drain is plugged if applicable or evaporator hose is plugged you can get the evap hose from under van it is on firewall

Bad News. I recently had the same type of smell ( no leaks or puddles either) coming from my van and had to have the intake manifold gasket replaced due to the Dex-cool issue. It appears GM installed an inadequate/substandard gasket when they built the van. My van only had 65,000 miles on it. There's a Dex-cool settlement you could have applied for but repairs had to be made by May of 2008.

This is the only real complaint I've had with the van.