What happens when you use an 11/32 hose over 5/16 tubing, even with double clamping...
With the lower (= transmission to cooler) hose as wet as this, I initially thought the upper hose was leaking and dripping onto the lower hose. But the upper hose is entirely dry. The lower hose appears to be leaking, and somehow the fluid "migrates" all around the hose, defying gravity?
I ran the engine for a few minutes while monitoring, and while I could feel some very light wetness, there was no visible dripping. It must be a very slow leak. There is a small stain on the plastic underbody shield below.
I didn't address the issue because I discovered it in the afternoon and wouldn't have enough daylight time left. ATF level was normal for the cold temperature. I figured it doesn't require immediate attention.
The fact that it happens only on the hose
to the cooler does worry me a bit regarding the pressure/resistance this cooler might add to the system. That's why I initially favored a tube style cooler. This stacked-plate style cooler does present more of an obstacle to fluid flow; on the other hand, at 11"×11" this cooler is pretty large, which should help fluid flow (?).
