Finally got transmission cooling lines installed and was proud of myself. No leaks from them as I put my tools away. Went out after lunch to top coolant in reservoir, - radiator on most G6s don't have radiator pressure caps so you having to either pour into overflow reservoir OR pull inlet hose from engine inlet and pour in. I chose the easy way and poured into reservoir. Waited about 5 minutes anxious because it took me the better part of two days for removal and install of new lines, and damned if it isn't dripping at least as hard as before I put lines in. Only difference is I could see fluid seeping at the bottom of black reservoir tank on side of radiator and before I couldn't. Now the fun part - all my reading says 3 main parts are front runner for culprit - 1. Radiator, 2. Water Pump - ohhh hell no!!! Or else it's the Coolant Crossover Pipe Gasket. I'm not especially keen in any of them but should it be the coolant crossover pipe gasket or God forbid the water pump, would it wrong of me to call GM and tell them come get the damn thing and bring me another vehicle? I know majority of maintenance items I have replaced in the last 3 years (at least 3 items have been replaced at least twice, some 3 or 4), have a TSB, a Recall or both of them

I've noticed coolant leaking from around the lower radiator support (bushing) AFTER car has been shut off and haven't been able to find any obvious signs of leaks. Seems what ever's causing leak also sucks dry the overflow. Finally had to replace trans cooling lines due to leak showing up at top connection to black tank attached to radiator, leak slowed/stopped for a while. and this morning it's dripping again. Hasn't overheated due to diligence in keeping fluid in overflow container.

The damn Dexcool is so expensive to keep having to buy a bottle every so often just to keep the damn car running, and really can't afford a new vehicle or major repairs. Also, in the last 3-4 years I've installed 2 water pumps - 1st install after original quit, 2nd install after first install quit working last May with less than 50,000 miles on either of them. Also installed new thermostat at time of 2nd water pump install and cleaned system.

Any suggestions, advice, possible solutions are welcome!!! I will check as much as possible myself and hopefully be able to make repairs. Any more issues and I will consider trying to get rid of it, trade or otherwise.

If it turns out to be water pump again, could I be faulted for serious considering attaching a bomb to the engine compartment and blowing it to the moon, leaving a crater big enough for a huge pool?

Update from Apr 2, 2018: Finally, after several tiring days of searching and taking parts off, checking them out and putting them back on, and having finally gotten the NEW transmission cooling lines firmly secured, and I was ready to put everything together I decided to wait and add fluid to the overflow reservoir first. Filled reservoir to cold fill line and walked away for 10 minutes. Came back out, lo and behold, I had a good 2' square of concrete driveway wet with fluid. Took 5 steps back then back down under the front end. Seems that the engine cleaning I had done the day before exposed the leak. Now to replace the radiator and hope that I don't damage the new transmission cooling lines in the process.