TRNW-2: Tundra's Thermal Bypass AB60

[John Lovell]

Just bought a 21 Tundra at the beginning of May, and shortly joined a
Tundra forum. This is a hot topic. Most there that use their truck like a
truck, towing campers to skid steers etc. leave it pinned. They claim
average temp stays 170-185.





On Mon, Dec 1, 2025 at 11:19 AM Brett Karulak via trnw2 <trnw2 at trnw.net>
wrote:

> Do any of you leave a cotter pin in the thermal bypass to keep the fluid
> always flowing to the cooler?  Not sure if it causes any problems and I
> assume by pushing the valve in and installing a pin to hold it that it
> bypasses the thermal valve and always flows. This is on a 2010 Tundra.
>
> Thank you,
> Brett
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