How hard is it to replace the thermostat on your 2002 Mercury Cougar?

Replacing the thermostat on a 2002 Mercury Cougar is generally considered a moderate DIY task. It typically involves draining the coolant, removing the necessary components to access the thermostat, and then replacing it, which may require some basic tools. While it's not overly complicated, it can be time-consuming and may be challenging for those without mechanical experience. Proper precautions should be taken to avoid coolant spills and ensure a proper seal upon reassembly.