Is there a fuse for windshield washer on a 1990 Mercury Cougar?

Yes, the 1990 Mercury Cougar has a fuse for the windshield washer system. You can find the fuse in the fuse box, which is typically located under the dashboard or in the engine compartment. If the washer isn't functioning, checking the fuse is a good first step, along with inspecting the washer fluid level and pump. Always refer to the owner's manual for the specific fuse rating and location.