Materials Needed:
- Replacement freeze plugs
- New coolant (antifreeze and water mix)
- Socket set
- Rubber mallet
- Container to catch coolant
- Pliers
- Small hammer
- Pick tool
- Safety goggles
- Gloves
Procedure:
1. Preparation:
- Allow your vehicle to cool down completely.
- Park your vehicle on a flat surface.
- If necessary, raise the vehicle using jack stands or a lift.
2. Locate Freeze Plugs:
- Find the freeze plugs on your engine block. In the 1991 Ford Explorer, they're usually round and made of brass or rubber. If you can't find them easily, consult the vehicle's service manual.
3. Drain Coolant:
- Place the container under the vehicle to catch the draining coolant.
- Locate the radiator drain plug and open it using a wrench. Some vehicles may have a drain valve in the lower radiator hose.
- Allow all the coolant to drain. Ensure you catch as much as possible to prevent spills and environmental contamination.
4. Remove the old freeze plug:
- Tap the freeze plug gently with a rubber mallet or the small hammer to loosen it.
- Use the pick tool to pry out the old freeze plug. Be careful not to drop the old freeze plug into the engine block.
5. Clean the area:
- Clean the area where the freeze plug was removed, removing any dirt, debris, or old sealant.
6. Install the new freeze plug:
- Coat the new freeze plug with a thin layer of sealant if specified by the manufacturer's instructions.
- Press the new freeze plug into the hole using your hands or a rubber mallet.
- Gently tap the freeze plug until it's fully seated.
7. Refill the coolant:
- Close the radiator drain plug or the lower hose valve.
- Refill the cooling system with the recommended amount of coolant. Use a 50/50 mix of antifreeze and water unless specified otherwise in your vehicle's owner's manual.
- Replace the radiator cap.
8. Start the Engine:
- Start the engine and let it run for a few minutes.
- Check for leaks around the new freeze plug. If you see any leaks, retighten the plug or add more sealant as needed.
9. Check Coolant Level:
- Monitor the coolant level for a few days. If it drops, top it up to the recommended level.
Note:
- If the freeze plug is located on the back of the engine, you might need to remove some parts to access it. Refer to your vehicle's service manual for specific instructions on accessing and replacing the freeze plugs in your vehicle.
- Always wear gloves and eye protection when working with automotive fluids.
- Never start your engine with the coolant reservoir empty, as it can damage the engine.
