I just noticed yesterday that my truck seems to have 3 radiators. The big one is obviously for the engine, and the smaller one in front of that I assumed was for the transmission? but then i looked underneath the front of the truck and saw a really tiny, 3rd radiator. Can someones tell me whatit is for? thanks.

 

There's only 1 radiator in the truck. You also have an oil cooler, a trans cooler, and a ac condensor that all look similar to a radiator, but are not radiator's.

 

Close ...

radiator (coolant/trans)
power steering
ac condenser
aux trans cooler (only works above 185*)

 

On a side note, that temperature bypass thing in the trans line pissed me off...took like an hour to flush my transmission 'cause of that stupid thing.