I just did a drain & fill on my Sienna (first time I did it on this vehicle). I saw that the radiator cap was far back in the engine compartment, close to the windshield. I did manage to pour in the new coolant, but I was wondering why they ran a hose all the way from the radiator to the cap, when they could have placed it on top of the radiator itself, like most other cars. Is there any advantage to doing it this way--does it make it more difficult for steam to escape the cap, for example? Or would that hose allow some heat to escape (and not build up inside)?
I do have one other question. Is the overflow reservoir a separate unit that can be removed by itself? I jostled it like I did the one in my Civic (which came out pretty easily) and got some resistance, so I decided not to push it and possibly break something. There was no sludge inside the reservoir anyways, so cleaning it wouldn't have done much if I'm not mistaken. But can these things be removed and cleaned?
I do have one other question. Is the overflow reservoir a separate unit that can be removed by itself? I jostled it like I did the one in my Civic (which came out pretty easily) and got some resistance, so I decided not to push it and possibly break something. There was no sludge inside the reservoir anyways, so cleaning it wouldn't have done much if I'm not mistaken. But can these things be removed and cleaned?
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