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There doesn't appear to be a freeze plug on the front of the block.
They are always located on the lower sides of the block.
If you can see water on the front of the engine do a visual inspection when the motor is off and cold.
Take a rag and dry off any noticeable moisture. Start the engine and let it warm up, carefully check all the areas listed below to see if you can isolate the leak.
The radiator could be leaking and dispersing coolant towards the motor while driving the car. A hose or fitting could be leaking. The intake manifold or thermostat gasket could be leaking. The water pump could be leaking at higher RPM's.
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
there are three freeze plugs on each side of motor on the block. if you look above the oil pan from the bottom you can see them. I think it is probably the water pump. this would leak at the front of engine by the heads
I can give you a couple of possible causes(1)freeze plugs in the block,there round & look like drink coasters,but are brass(2)intake manifold gasket can be leaking from the corners where water jackets are/also the head gasket both are on all four corners,I don't know what motor you have,but there are pipes that are called crossovers that run from the back off the timing cover to the heater core on the fire wall,sometimes on top of the manifold on one side & there will be a hose connected to it possible bad hose or corroded tube?
You don't say which engine you have but if I were you I would get a cooling system tester and test your cooling system. Very simple to use you just remove your radiator cap and install the tester and pump it up to the PSI listed on your radiator cap. You may be able to rent one. After you pump it up watch for the leak and pinpoint it. Not knowing which engine you have, I'm guessing the 4.3 liter. I believe there is a heater hose connector in the right hand side of your intake manifold. Those are common for leaking. I'm not sure where your compressor is located. Also you may have an intake manifold gasket leaking which is common. With the tester you should be able to trace it down. Also it is possible that your new pump could be faulty or it it possible that you didn't get the gasket surface area clean?
The front pump seal on the power steering pump - located behind the power steering pump pully tends to leak on these. To fix it you are better off replacing the entire pump assembly because the drive shaft tends to wear crooked and messes up the seal. Also, these are known for oil cooler lines leaking which is directly below power steering pump which can be mistaken for power steering pump leak.