You are listing the " TO Towing Prep Option" you should have that cooler.
the sienna tow package does not come with the hitch unless the hitch was ordered.
I know I looked up both the first and second gen tow package, which your I believe your's is a second gen. I have looked where I describe before and saw the trans cooling radiator there on both the gens. Only because I was looking at buying a second gen at one time.
My understanding is the tow package has, which the first 4I have confirmed with the parts department. Item 3 and 4 I have seen.
1) different radiator, with a build in transmission cooler. (primary Trans cooler)
2) the two radiators fans are different. They run at a higher RPM
3) the is a oil cooler. You see two water lines going to the engine block side of oil filter.
4)large secondary trans cooler that is ahead the driver side inner fender. It is as low in that area as they could put it. You can also follow the trans cooler lines coming out of the transmission. If both go to the trans mission you don't have it. One should go under the battery into the fender area and the should be a second from the fender area that go's to the transmission.
5) I heard but not sure the follow were also added. larger alternator, prewiring package.
My first gen 2001 did not have the package. I added was a large double stacked trans cooler 12"x~5"x~2", I think it was a B&M changed the trans fluid to synthetic and aid bags. I think on you toyota you can change the fluid to the next gen fluid "One world" (check with toyota) it is a very good synthetic.
The cooler I added. With new hoses. I routed the output side of the radiator trans cooler to the lower hose input side of the new trans cooler and the output side of the new cooler to the transmission. To avoid an air lock in the trans cooler have your input and output on the side. Do not have them on the top or bottom.
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Art & Joyce
Current camper: Motor Home
Previous: 2009, 3023-QB and 2003 2720
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