I believe the water pump on my 07 4.3 Vantage is leaking fairly substantially. I have not been able to find any info at all online about this, either replacement parts or info on the replacement process.

Here's a pic of the underbody: https://i.imgur.com/lbUgupp.jpg

Does anyone have any experience with such a process? I am weighing options of bringing it to a shop or going full DIY.

 

No way to tell what's leaking in that picture - nothing in the pic is related to the coolant system. If you can figure out where it's leaking from we can go from there.

 

Thank you I will try to get some better pics, as far as I could tell I could only see the white residue coming from the main pulley area in the center of the block.

 

The thermostat is located on the driver side of the engine, near the pulley, a bit above the valve covers (looking at the car from the front). So take a look there and see