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Discussion Starter · #1 ·
I have a 2002 Tundra V-8. I have a question. In the Haynes manual there is reference to an AT oil cooler in the front of the radiator on page 7B-5. Then there are hoses that go to some sort of internal cooler inside the main radiator. What are those for? I am confused.

Scoob
 

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The hose at the bottom of the cooler is the inlet where the fluid enters the
cooler, for obvious reasons. After completing it's journey through the cooler
it returns to the transmission through the hose at the top. Hope this helps.

John
 

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Discussion Starter · #3 ·
I am saying there are two separate coolers, one in front of the main radiator and one inside the main radiator.

Scoob
 

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Normally, ATF is cooled/heated by the engine coolant in the radiator. When equipped with 'tow' or 'heavy duty' packages, an additional cooler is adding inline in series to the ATF cooler in the radiator.
 

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Normally, ATF is cooled/heated by the engine coolant in the radiator. When equipped with 'tow' or 'heavy duty' packages, an additional cooler is adding inline in series to the ATF cooler in the radiator.
Exactly. The lines run through the radiator to keep the ATF at operating temps.
A transmission cooler, which would be extra, keeps the fluid from overheating, especially when towing or with
a heavy load.

John
 
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