Where is the block heater plug on a 1991 Ford Explorer 4.0L V6 located?

On a 1991 Ford Explorer with a 4.0L V6 engine, the block heater plug is typically located near the front of the engine, close to the passenger side. It is usually found on or near the engine block, often near the oil pan or near the transmission bell housing. You may need to look for a rubber or plastic plug that can be pulled out to access the heater's cord. If you're having difficulty locating it, consulting the owner's manual or a repair guide can provide additional guidance.