If you’ve been hearing a “chirp, chirp, chirp” or squealing sound coming from the Duratec 35 3.5L V6 engine in your 1st generation (2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018 and 2019) Ford Flex, you may need to replace the serpentine accessory belt. Check out my DIY tutorial for the procedure (with the compatible replacement part numbers) by clicking on the text link or thumbnail image below.
2009-2015 Ford Flex Serpentine Accessory Belt Replacement Guide
