Four quarts of anti-freeze mixed 50/50 with four quarts of preferably distilled water should do the job, you may have some left over.
Radiator or hose but probably water pump
On a 1993 Ford Explorer : None , unless it has been converted from R12
The radiator itself probably holds a half gallon. The car as a whole would hold about 2 gallons.
You are experiencing the classic symptom of a leaking heater core. They aren't cheap. Some stop-leak in the radiator might get you through the interim if you need to budget it.
How's the water pump?
Suspect blowed head gasket or not so smart person putting oil in instead of antifreeze
If you have the VG30E model 3litre engine then:down to -15C (5F) needs 30% antifreeze mix. Down to -35C (-30F) needs 50% antifreeze mix. NB 4x2 model has a 10.7 l radiator while the 4x4 model has an 11.7 l radiator.
Check the water pump
'Regular' or 'traditional' ethylene glycol antifreeze with silicate type corrosion inhibitors (sometimes called green antifreeze) mixed 50% with distilled water is the OE fill.
1) Take the cap off the radiator.2) Look for a stopcock at the bottom of the radiator. Open it. The coolant will drain out.3) Close the drain.4) Fill the radiator as full as you can.5) Replace the radiator cap.6) Start the motor7) Top-off the resevior as needed. The system will drain the resevior as the motor refills.Don't leave the system dry or the gasgets and rubber seals will dry up and go bad. You do _not_ want that.
How do you replace a radiator in a 1993 suburban?
The air in the antifreeze on a 1993 Dodge Stealth will bleed out if you leave the coolant cap (the cap that screws onto the radiator hose connecting tube, NOT the antifreeze overflow plastic cap) off while the engine warms up. After the thermostat opens when the engine is warm, the antifreeze will start to flow from the engine, through the upper radiator hose, and into the top of the radiator. When you do not see bubbles at the filler neck where you removed the cap, the air should be expelled and you can put the cap back on.