Block heaters are not a factory option, they must be installed by the owner. If you are the original owner, there is no block heater. If you see an electric cord hanging out of the front of the car, you might have a block heater, or a oil pan heater, or a battery charger. Follow the cord, and see where it goes. A block heater is a device for heating the coolant to keep the engine warm in cold weather. It is generally connected to the heater hoses, and can be mounted somewhere in the engine compartment, or just hanging from the hoses.
Defrost is the default position. Most likely a vacuum leak somewhere between the engine compartment and the passenger compartment. Look for a small black hose going through firewall ti the heater box inside. It should have vacuum from the engine on it. if not it's on the engine side. if it does it's probably in the passenger compartment. just trace the line back looking for the leak.
The heater fuse for a 1993 Geo Tracker is located in the fuse box that is inside the engine compartment on top of the battery. It would also be a good idea to check the wires on the heater relay that is on the passenger side of the engine compartment on the fender wall. It is just behind the washer fluid receptacle.
Once a heater core starts to leak, the only remedy is to replace it.Luckily it appears to be a pretty straight-forward job on the Windstar - the heater core is at the bottom of the center of the dashboard - remove the ductwork and some of the trim pieces to expose the heater core compartment.Of course, this is after draining the engine coolant and disconnecting the heater hoses in the engine compartment.See "Related Questions" below for more...
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