Explore a cost-effective repair solution for a 2011 Toyota Sienna AWD with a howling rear viscous coupler in this 51-minute video from South Main Auto Repair LLC. Learn how to save customers significant money by addressing the simple bad bearing issue instead of replacing the entire coupler as recommended by Toyota. Gain insights into diagnosing and fixing this common problem, potentially saving nearly $2000 compared to dealership repairs. Follow along as the mechanic demonstrates the repair process, offering valuable tips and techniques for automotive enthusiasts and professionals alike.