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Thermostat pin on Genuine Cooling system

Discussion in '2.5 Gen Tundras (2014-2021)' started by Dustygirl825, Jun 21, 2025.

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Jun 21, 2025 at 6:52 AM

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Dustygirl825 [OP] New Member

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Jun 12, 2025

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#136371

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2020 SR5 Tundra 2005 Taco

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Good morning all! Newbie here on this awesome Forum. I’m getting ready to install the Trans Cooler on my 2019 Tundra and have a question. I’m no mechanic, so have to ask. What is the purpose of the bypass pin AND at what point do I pull the pin? Before checking Oil level or after? I feel as if its a dumb question so apologies if it is

Dustygirl825, Jun 21, 2025

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