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Thermal bypass valve?? Replaced with aftermarket with no internal obstruction

I have no idea what this means???

The heating issue was present since I purchased the truck last fall with 120k mikes. No I don’t know history of this truck but can tell it was used in a dusty environment by the dust in the nooks and crannies.

Sorry I did not see the expanded area. my local transmission shop used synthetic fluid for this truck not sure of either brands. Yes the TBV is the bypass I’m referring to. And the temps are trans. The engine temp runs between 195 and 210 towing.

Not sure how to know if torque converter is locking???

Bought truck with Aisin. Worked like a champ with towing in mountains under load and never exceeded 185 transmission temp. That was my loaded 16 but tried to downsize and truck sold quickly trailer never sold so trying to get back there.

I live in east Texas but travel to the Rockies. I replaced the engine t stat but the transmission fluid line forward to the cooler has a factory installed bypass to help transmission to warm up faster just returning fluid until it’s warm then the valve opens and goes to normal flow. I researched my heating...

sorry for my confusing message. The temp I’m talking about is transmission. Plus whomever asked why I’m calling my truck Aisin is referring of course to the type of transmission vrs 68RFE.

No obstruction. No bent fins no dirt clogs

I know this is late but just another IMHO I pulled 42’ fiver with 68RFE into Rocky Mtn Natl Park but coming out through Central City I smoked that bugger so bad they could only use carcass to rebuild. Got home and bought Aisin never looked back. Pulls my 18,500 TT never getting above 180.

Have 2014 3500 Limited 4x4 crew can. The Aisin keeps getting to warm in my opinion. I’m pulling 42’ fifth wheel TT at 18,500 lbs (well within limits) and on moderate hills and flat ground I’m hitting 220 fan starting around 210. I’ve serviced all fluids with synthetic, replaced the bypass...