The heated driver's seat fuse for a 2008 Mercury Mountaineer is
not located in a standard fuse box. Heated seats in this vehicle are controlled by the Body Control Module (BCM) and are protected by circuitry *within* the BCM, not by a replaceable fuse in a readily accessible fuse box.
If your heated driver's seat isn't working, the problem is much more likely to be a faulty seat heater element, a wiring issue, or a problem with the BCM itself rather than a blown fuse. You'll need a qualified mechanic or automotive electrician to diagnose and repair the issue.
