However, if you're determined to do it yourself, here's a general overview. This is not a substitute for a proper repair manual specific to your 1999 Ford Windstar. Consult your owner's manual and a reputable repair manual (like a Haynes or Chilton manual) for detailed instructions and torque specifications.
Tools and Materials You'll Need:
* New transmission fluid: The correct type and amount are crucial. Consult your owner's manual to determine the correct fluid specification (likely Mercon or Mercon V). Buy enough fluid to complete a complete drain and fill, likely multiple quarts.
* New transmission fluid filter: This is essential.
* Drain pan: Large enough to hold several quarts of fluid.
* Wrench: For the drain plug on the transmission pan.
* Socket set: For removing the transmission pan.
* Jack and jack stands: Safety is paramount. Never work under a vehicle supported only by a jack.
* Torque wrench: To tighten the transmission pan bolts to the correct specification.
* Funnel: To pour in the new fluid.
* Rags or shop towels: To clean up spills.
* Gloves: To protect your hands.
* A helper (optional but recommended): Makes the job easier, especially when removing and reinstalling the pan.
Procedure (General Outline - Consult your repair manual for specifics):
1. Warm up the transmission: Drive the vehicle for 15-20 minutes to warm the fluid. This will make it flow more easily.
2. Secure the vehicle: Safely raise the vehicle using a jack and secure it on jack stands.
3. Locate the transmission pan: It's usually located on the bottom of the transmission.
4. Drain the fluid: Carefully position the drain pan under the transmission pan and remove the drain plug. Let the fluid drain completely. This can take a while.
5. Remove the transmission pan: Remove the bolts securing the transmission pan. Be careful, as the pan will likely still contain some fluid.
6. Replace the filter: Replace the old transmission filter with a new one.
7. Clean the pan: Clean any debris or old gasket material from the transmission pan.
8. Install a new gasket: Apply a new gasket to the transmission pan (if necessary – some pans use a sealant).
9. Reinstall the transmission pan: Carefully reinstall the transmission pan and tighten the bolts to the correct torque specification using a torque wrench.
10. Refill the transmission: Using a funnel, add the new transmission fluid to the transmission. Refer to your owner's manual for the correct amount. You may need to add fluid in stages, checking the fluid level.
11. Check the fluid level: With the engine running and the transmission in Park (or Neutral, depending on your Windstar's design), check the fluid level using the dipstick (if your Windstar has one). Add more fluid if necessary, again referring to your owner's manual for the correct procedure.
12. Lower the vehicle: Carefully lower the vehicle.
13. Test drive: Take the vehicle for a test drive to ensure the transmission is functioning correctly.
Important Considerations:
* Fluid type: Using the incorrect transmission fluid can severely damage your transmission. Double-check your owner's manual.
* Torque specifications: Using the incorrect torque when tightening the transmission pan bolts can damage the pan or the transmission. Use a torque wrench and consult your repair manual.
* Safety: Always prioritize safety when working under a vehicle. Use jack stands and never rely solely on a jack.
This is a general overview. The exact procedure may vary slightly depending on your specific Windstar model and transmission type. Always consult your owner's manual and a repair manual for detailed, model-specific instructions. If you are unsure about any step, seek professional help. Improper transmission fluid changes can lead to expensive transmission repairs.
