The block heater in a 1998 Ford Windstar (if it has one – not all models came equipped with them) is located on the
engine block, near the thermostat housing. It's usually a threaded fitting, and often has a cord that runs down to a connection point near the front of the vehicle, typically under the front bumper area. You might need to look closely, possibly with a flashlight, to locate it.
Because its location is somewhat tucked away and can vary slightly depending on engine specifics, you'll have better luck finding it visually than through a precise description. Consulting a 1998 Ford Windstar repair manual specific to your vehicle's engine (3.0L Vulcan or 3.8L Essex) would provide the most accurate and detailed location.
