If the A/C system in your first generation (2010, 2011, 2012, 2013, 2014, 2015 & 2016) GMC Terrain SUV hasn’t been working as well recently or the air coming out of the vents smells a bit musty or moldy, you might need to clean or change the cabin air filter element. Take a look at my DIY instructions for the procedure (with the replacement part numbers) by clicking on the text link or thumbnail image below.
2010-2016 GMC Terrain A/C Cabin Air Filter Replacement Guide
