i would start by testing the battery , i have seen cases where the battery was good enough to start the vehicle but was causing the alternator to do all the work resulting in premature failure. my f150 went through a brand new Ford alternator in 2 months .
The alternator acts as the belt tensioner.
A failing alternator.
where is the classis location for toyota sienna
toyota sienna 2001
The 2005 Toyota Sienna has 24 valves.
The 2013 Toyota Sienna has 24 valves.
The 2010 Toyota Sienna has 24 valves.
The 2004 Toyota Sienna has 24 valves.
The 2001 Toyota Sienna has a V6 engine.
The 2003 Toyota Sienna has 24 valves.
The 2014 Toyota Sienna has a V6 engine.
The 2009 Toyota Sienna has 24 valves.