How do you do flush radiator coolant, and change the thermostat on this van?

Flushing the radiator coolant and changing the thermostat in your 2003 Ford Windstar can help maintain your engine's cooling system and prevent overheating. Here's a step-by-step guide on how to do this:

Flush Radiator Coolant:

Gather Materials: You'll need a container to catch the old coolant, new coolant, distilled water, a wrench or socket set, a funnel, and safety gloves and eyewear.

Prepare the Vehicle: Make sure the engine is cool before starting. Park the vehicle on a level surface and engage the parking brake. Open the hood and locate the radiator cap and the drain plug on the radiator.

Drain the Coolant:

Place a container under the radiator drain plug to catch the coolant.
Open the drain plug using a wrench or socket. Allow the coolant to drain completely into the container.
Once drained, close the drain plug securely.
Flush the System: This step is optional but recommended if the coolant is old or contaminated. You can use a commercial radiator flush solution according to the manufacturer's instructions.

Refill with Water:

Close the radiator drain plug and remove the radiator cap.
Use a funnel to slowly add distilled water to the radiator until it's full.
Run the Engine:

Start the engine and let it run for a few minutes with the heater turned on. This helps circulate the water through the cooling system and flush out any remaining coolant and contaminants.
Drain Again:

Turn off the engine and allow it to cool down.
Open the drain plug and let the water drain into the container.
Install New Thermostat and Fill with Coolant:

Locate the thermostat housing (usually connected to the upper radiator hose where it enters the engine).
Remove the housing, replace the thermostat, and reinstall the housing using a new gasket.
Close the drain plug and fill the radiator with a 50/50 mixture of coolant and distilled water. You can also follow the coolant manufacturer's recommendations.
Bleed the Air:

Start the engine with the radiator cap off and let it run until the thermostat opens and the coolant starts circulating.
Top off the radiator with more coolant mixture as needed.
Check for Leaks: Observe the cooling system for any leaks around the drain plug, thermostat housing, or other connections.

Change the Thermostat:

Locate Thermostat: Find the thermostat housing, typically connected to the upper radiator hose where it enters the engine.

Drain Coolant: If you haven't already drained the coolant as part of the flushing process, you might need to drain some to prevent spills when you remove the thermostat housing.

Remove Thermostat Housing:

Disconnect the upper radiator hose from the thermostat housing.
Remove the bolts securing the thermostat housing to the engine.
Replace Thermostat:

Remove the old thermostat.
Install the new thermostat in the correct orientation (follow the manufacturer's instructions) and place a new gasket.
Reassemble:

Reattach the thermostat housing and secure it with the bolts.
Reconnect the upper radiator hose.
Refill Coolant: Follow the steps mentioned earlier to refill the radiator with a proper coolant mixture.

Bleed Air and Check for Leaks: Start the engine, let it warm up, and make sure the thermostat opens and the coolant circulates. Check for leaks around the thermostat housing and connections.