Leaky gasket on coolant bypass housing.

That is why it is leaking you didn't install a gasket or seal at all.

See my corrected post above. I had it backwards between the two gaskets and pipes.

There should be a flat gasket on the flange. See part numbers above.



I hope this helps. It sucks that you will have to do it over.

 

I picked up the correct gasket today. And I was able to install it without removing anything but the bolts.

I accessed the forward bolts from the top, and the rear one from under the truck. Move the pipe aft and slide the gasket in

 

I pray you have no more leaks?

Did you buy the pipe from Toyota? I'm surprised that they didn't tell you that you would need a gasket to go with the replacement steel pipe.

 

It's looking like that so far. The pipe is bone Dry right now. Gonna go wash the truck and park in a different spot.

I didn't see any new drips, or steady streams, just from what was left over from when I drained it

 

I had to replace this part on my 2010 Tacoma 5 years ago. Here's what I had to disconnect/remove to get to it:

Air intake assembly
Throttle body
Fuel injection lines
Intake manifold
Driver side front wheel (to get to bottom bolts on manifold)
Various vacuum lines and wiring harnesses

For me this was a day and a half of work. The part alone was about $70. My Toyota dealer offered to do the job for around a grand, understandable considering the labor involved.

What ticked me off about this is that the original bypass tube was made out of plastic and was disintegrating like old rotten particle board when I replaced it with the stainless-steel upgrade. I can imagine some weenie at Toyota patting himself on the back for all the money he saved using crap-tier materials.

Same thing with my radiator last week. Investigating a leak, I pulled the upper coolant hose from the radiator and the plastic connection nipple of the radiator broke into pieces.