The freeze plugs on the 1994 Ford Ranger have locations that vary slightly depending on the engine choice. On most trucks the freeze plugs are on the engine block below where the spark plugs are located.
There are numerous freeze plugs. There are some in the cylinder heads. There are some on the side of the engine block and on the rear of the engine behind the flywheel. You will need to pressure test the cooling system to find the leak.
There is a freeze plug located on the "passenger side" of the engine. It can be seen by jacking up the car and looking above the coolant sensor. If it is bad, antifreeze may be puddling toward the center of the car where the engine and transmission meet.
if it's like my 2002 it has a service engine code light on with a speed sensor code.it doesn't have a speed sensor, it means you need to check plugs/wires/or the electronic assy.itself.my problem was the plugs.