Remove the plastic radiator close-out panel (the flat black plastic panel that is above the radiator, with a cutout for the hood latch). It is easy to remove.

This should give you a good look at the area you mentioned - using a good auxiliary light.

 

They all go there ...friggon plastic tanks...hopefully your drivers side hose has the factory clamp in the up position as they can be a bear underneath

 

May be the plug at the bottom of radiator on the passenger side. It’s small and plastic. Maybe the oring dried out or someone cross threaded it for you.

 

OK, Part Deux, Radiator Leak.
The seam on the passenger side is split open. There are transmission coolant lines there with a funky clip.
Anyone know how to remove these without having to scrap it all?

One thing leads to another.......

 

OK, Part Deux, Radiator Leak.
The seam on the passenger side is split open. There are transmission coolant lines there with a funky clip.
Anyone know how to remove these without having to scrap it all?

One thing leads to another.......

The two transmission fluid cooling lines are released from the radiator by use of a “quick release” tool. It is donut shaped, various sizes, with a slit on one side (to enable to donut-shaped tool to slide over the metal line).

The tool is placed over the metal line, slid toward the radiator, and into the fitting area (using one hand). This spreads the clip - then you push the metal line with your other hand toward the radiator and it releases. Then pull the line rearward to remove.

Be prepared for transmission fluid to leak out. Have several plugs (such as golf tees) handy, to quickly plug the cooling lines. Prior to disassembly, determine where you will move the line, so it is out of the way. I use old towels or paper towels to wedge the end of the line by something. This also helps catch any fluid that may leak.

Take your time and clean the fitting area prior to dislodge any dirt or debris.

The tools are usually sold in a 3 or 4 piece sets at most auto part’s stores.

If I recall correctly - the clips on the end of the metal line are replaceable. I have purchased two new clips from a dealer prior to the work, in case the clip(s) are damaged upon removal. I always use new clips to avoid leaks and problems on reassembly.

Keep in mind the transmission fluid cooler inside the side radiator tank will contain fluid that will have to be replaced when the new radiator is installed. It will leak out of the bottom fitting when you remove the two lines (I remove the top one first).

I have not removed the radiator on an 8th (or 9th) generation Impala with the 6-speed transmission (only the 4-speed one). You may want to look closely at the cooling lines’ fittings at the radiator, take a cellular picture, and have your dealer provide you with the correct fittings (take your VIN number to ensure the correct clips).

Good luck - let us know how things turn out.