Warning: Working on your car can be dangerous. If you're not comfortable with automotive repair, it's best to take your car to a qualified mechanic.
Tools and Materials You'll Need:
* New Transmission Fluid: Check your owner's manual for the correct type and amount. Use only the recommended fluid (Dexron III or Mercon, likely). You'll likely need several quarts.
* Transmission Fluid Drain Pan: A large capacity pan is recommended to catch the old fluid.
* Wrench: The size will depend on your drain plug (if accessible). Probably a 10mm or 12mm. Check the drain plug location first before buying any tools.
* Funnel: A long-neck funnel is best for easy pouring into the transmission.
* Jack and Jack Stands: Essential for safe and proper access to the transmission.
* Wheel Chocks: For added safety.
* Gloves: To protect your hands from the used transmission fluid.
* Rags or Shop Towels: For cleanup.
* Torque Wrench (Optional but Recommended): To ensure the drain plug is tightened to the correct specification.
* Fluid Transfer Pump (Recommended): Makes removing and adding the fluid less messy.
Partial Transmission Fluid Exchange Procedure:
1. Safety First: Park the car on a level surface, engage the parking brake, and use wheel chocks. Jack up the car and securely support it with jack stands. Never work under a car supported only by a jack.
2. Locate the Transmission Drain Plug (If Applicable): On some 1999 Mercury Mystiques, there is a transmission drain plug on the transmission pan. Locate this if possible. If you can find it:
* Place the drain pan under the drain plug.
* Carefully loosen and remove the drain plug. Let the fluid drain completely. Be careful, the fluid will be hot.
* Once drained, replace and tighten the drain plug (to the proper torque specification if you have a torque wrench).
3. Locate the Transmission Fill Port: This is usually on the side of the transmission. It may require removing the air cleaner assembly or some other components for access. Your owner's manual will help locate this.
4. Remove Old Fluid (if drain plug method isn't possible): If there isn't a drain plug, you'll need to remove the transmission pan. This is more complex and may require additional tools (sockets, ratchet, etc.). There will be some fluid in the pan, but the bulk of the fluid will stay inside the transmission.
5. Add New Fluid: Using a funnel, add the recommended amount of new transmission fluid through the fill port. Check your owner's manual for the correct amount. It's often best to add slightly less than the full amount.
6. Run the Engine: Start the engine and let it run for a few minutes. Check the transmission fluid level using the dipstick (if available – some don't have them). You may need to add more fluid.
7. Repeat: This is a partial exchange, so repeat steps 2-6, replacing another 3-4 quarts of fluid. Do this multiple times until the fluid coming out is significantly cleaner.
8. Check Fluid Level: Check the fluid level one last time. Ensure it is at the correct level on the dipstick, or as instructed in the owner's manual.
9. Lower the Vehicle: Carefully lower the vehicle using the jack.
10. Dispose of Used Fluid Properly: Take the used transmission fluid to an auto parts store or recycling center for proper disposal.
Important Considerations:
* Consult your owner's manual: It's the best source of information regarding your specific vehicle.
* Transmission Pan Gasket (If Applicable): If you remove the transmission pan, you'll need a new gasket.
* Professional Help: If you're not comfortable with this process, take your vehicle to a qualified mechanic. Improperly performing this task can damage your transmission.
This is a simplified procedure. Always refer to a repair manual specific to your 1999 Mercury Mystique for detailed instructions and torque specifications. Improper fluid changes can significantly shorten the life of your transmission.
