Here's a general procedure. Specific steps might vary slightly depending on your exact Ranger model and engine configuration (there were a few 4L engines offered that year). Consult your owner's manual for details specific to your vehicle.
Tools and Materials You'll Need:
* New coolant: Use the correct type and amount specified in your owner's manual (usually a 50/50 mix of coolant and distilled water). Don't use tap water.
* Drain pan: Large enough to hold several gallons of coolant.
* Wrench: To remove the radiator drain petcock (a valve at the bottom of the radiator) and possibly the lower radiator hose.
* Hose: A garden hose with a spray nozzle is helpful for rinsing.
* Funnel: To refill the radiator.
* Protective gloves and eyewear: Essential for safety.
* Optional: Radiator flush: Chemical radiator flush can help remove stubborn deposits. Follow the product's instructions carefully.
Procedure:
1. Locate the drain petcock: This is usually located at the bottom of the radiator, often with a small valve or plug. If your Ranger doesn't have a petcock, you might need to disconnect the lower radiator hose instead (prepare for more spillage).
2. Drain the coolant: Place your drain pan under the drain petcock or lower radiator hose connection. Carefully open the petcock or disconnect the hose to allow the coolant to drain completely. This may take some time.
3. (Optional) Radiator Flush: If using a chemical flush, follow the manufacturer's instructions carefully. This usually involves adding the flush to the radiator, running the engine for a short time, and then draining it again.
4. Flush with water: Once the old coolant is drained, use your garden hose to flush the radiator. Connect the hose to the upper radiator hose inlet (where the coolant enters the radiator) and let water flow through. Allow the water to flush out any remaining debris or sediment from the radiator. You'll likely want to run water out the drain petcock or lower hose until the water runs clear. If there’s a lot of debris, you may need to repeat this several times.
5. Reconnect the lower radiator hose (if applicable): If you removed the lower radiator hose, carefully reconnect it, ensuring a tight seal.
6. Refill the radiator: Using your funnel, carefully pour the pre-mixed coolant into the radiator until it's almost full. Check your owner's manual for the proper coolant capacity for your specific vehicle.
7. Bleed the air out of the cooling system: This is crucial to prevent overheating. There are usually bleed screws on the engine block or radiator. Locate these and open them while someone slowly adds coolant to the radiator to push out any trapped air. Close the bleed screws once coolant flows out steadily without air bubbles. Your owner’s manual will show you where they are.
8. Run the engine: Start the engine and let it run for about 15-20 minutes. Monitor the temperature gauge and ensure the engine doesn't overheat. Check the coolant level in the radiator and reservoir and add more as needed.
9. Check for leaks: After the engine has cooled, carefully inspect all hose connections and clamps for leaks.
10. Top off coolant: Once the engine has cooled completely, check the coolant level and top it off to the recommended level.
Important Considerations:
* Check your owner's manual: This is the most important step. The specific procedures and recommendations might vary based on your Ranger's exact model and engine.
* Disposal: Coolant is toxic. Dispose of the old coolant properly at a local recycling center or auto parts store.
This is a general guideline. If you are uncomfortable performing this task yourself, it's best to take your vehicle to a qualified mechanic. Improper flushing can damage your cooling system.
