Question about 2004 Toyota Sienna
A probable temporary remedy is to add more silica oil on the fan clutch. Silica oils has a distinctive property, it exhibits the exact opposite reaction of regular oil. Regular oil when the surrounding temperature goes up tends to be viscous, thinner. The silica oil tends to be thicker and hence the fan clutch would engage earlier/harder. Depending on the design, there would be a not easily removable plastic or rubber grommet/stopper somewhere in the body of the clutch, this is where you could add drops of the silica oil.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
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Posted on Jul 25, 2008
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