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What size fuse does a 1999 ford windstar takefor the heater and speedometer?

There isn't a single fuse for both the heater and speedometer in a 1999 Ford Windstar. They are on separate circuits and therefore protected by different fuses. To find the correct fuse amperage, you must consult your owner's manual. The manual will have a fuse box diagram showing which fuse controls what and its amperage rating.

Looking at online diagrams for 1999 Windstars shows multiple fuse boxes (under the hood and inside the vehicle), and the specific fuse for the heater blower motor and the instrument cluster (which includes the speedometer) varies depending on options and specifics of the vehicle. Using the wrong amperage fuse can damage your electrical system.