Safety First:
* Let the engine cool completely before starting any work. Hot coolant can cause serious burns.
* Wear safety glasses to protect your eyes from splashes.
* Work in a well-ventilated area. Coolant is toxic.
* Have appropriate containers to collect the used coolant for proper disposal. Check your local regulations for proper disposal methods; it's usually not acceptable to pour it down the drain.
Tools and Supplies:
* Drain pan: Large enough to hold several gallons of coolant.
* Wrench: To loosen the drain petcock (if your vehicle has one) or radiator drain plug. Size will depend on your vehicle, usually a 10mm, 13mm, or possibly a different size.
* New coolant: Use the correct type and amount as specified in your owner's manual. Usually a 50/50 mix of coolant and distilled water.
* Funnel: To add new coolant.
* Hose: Garden hose is helpful for backflushing (optional but recommended).
* Bucket: For rinsing purposes (optional, but easier than using the drain pan multiple times)
* Gloves: Protect your hands from coolant.
Procedure:
1. Locate the Radiator Drain Petcock or Plug: The drain is usually located at the bottom of the radiator, on the driver's side. It might be a petcock (valve) or a bolt/plug.
2. Open the Radiator Cap: Carefully open the radiator cap *after* the engine is completely cool. Pressure buildup can cause hot coolant to spray out.
3. Drain the Radiator: Place the drain pan under the drain. Carefully open the drain petcock or remove the plug, allowing the coolant to drain completely.
4. Optional: Backflushing: This step helps remove more sediment.
* Disconnect the lower radiator hose: Carefully remove the clamp and detach the lower radiator hose from the radiator.
* Attach the garden hose: Connect the garden hose to the radiator inlet (top hose connection) with the hose pointed into the radiator. Turn the water on low to medium pressure to flush out any remaining debris. Let the water run through the radiator until it runs clear. Be ready to catch the outflow from the lower radiator hose connection.
* Reconnect the Lower Radiator Hose: Once the water runs clear, turn off the hose and reattach the lower radiator hose, securing it with the clamp.
5. Refill the Radiator: Use a funnel to add the correct type and amount of new coolant mixture (usually a 50/50 mix of coolant and distilled water) to the radiator. Refer to your owner's manual for the correct capacity.
6. Bleed the Cooling System: Air pockets can hinder cooling efficiency. The procedure for bleeding the cooling system varies between vehicles. Some models have bleeder valves; others require running the engine and letting it idle until the thermostat opens. Consult your owner's manual for your Aerostar's specific bleeding procedure. Usually involves running the engine for 10-15 minutes and periodically checking the coolant level and adding coolant as necessary.
7. Check for Leaks: After refilling, carefully inspect for any leaks around the radiator, hoses, and clamps.
8. Dispose of Old Coolant Properly: Take the used coolant to a recycling center or auto parts store that accepts used automotive fluids.
Important Notes:
* If you're uncomfortable performing this task yourself, take your Aerostar to a qualified mechanic. Flushing a radiator incorrectly can damage your engine.
* The steps above are a general guide. Your 1996 Ford Aerostar may have specific variations. Always consult your owner's manual for the most accurate instructions.
This detailed guide should help you flush your radiator, but remember that safety and accuracy are paramount. If you are unsure about any step, seek professional help.
