Safety First!
* Let the engine cool completely. Hot coolant can cause severe burns. Wait several hours after driving before starting.
* Wear safety glasses and gloves. Coolant is corrosive.
* Work in a well-ventilated area. Coolant fumes can be harmful.
* Have the correct coolant type. Consult your owner's manual to determine the correct type (usually a 50/50 mix of antifreeze and distilled water). Do not use tap water.
Tools and Materials:
* New coolant (50/50 mix of antifreeze and distilled water): The capacity is approximately 9-10 quarts, but it's best to buy a bit extra in case of spills.
* Drain pan: Large enough to hold at least 10 quarts.
* Wrench: To loosen the drain plug (likely a 13mm or 10mm, check your owner's manual).
* Funnel: To pour the new coolant into the radiator.
* Jack and jack stands (recommended): For easier access to the drain plug. Never work under a car supported only by a jack.
* Rags or shop towels: To clean up spills.
* Optional: Coolant recovery system: Makes the job cleaner.
* Optional: Pressure tester: To check the cooling system for leaks after the refill.
Procedure:
1. Locate the drain plug: This is usually located at the bottom of the radiator. Your owner's manual will show the exact location.
2. Position drain pan: Place the drain pan under the drain plug.
3. Open the radiator cap: Carefully twist and remove the radiator cap *after the engine has cooled completely*. Pressure may build up and cause hot coolant to spray out.
4. Open the drain plug: Use the appropriate wrench to slowly loosen and remove the drain plug. Let the coolant drain completely into the drain pan.
5. Locate the engine block drain plug (if applicable): Some vehicles have a second drain plug on the engine block. Consult your owner's manual to determine its location and whether it's necessary to drain it. If present, repeat step 4 for this plug.
6. Close the drain plugs: Once the coolant has drained, replace and tighten both the radiator and engine block drain plugs.
7. Remove and clean the radiator cap: Clean the cap thoroughly before reinstalling.
8. Fill the radiator: Using a funnel, slowly pour the pre-mixed 50/50 coolant into the radiator until it's nearly full. Do not overfill.
9. Start the engine: Run the engine for about 10-15 minutes. Check for leaks.
10. Top off the radiator: After running the engine, let it cool completely again. Then, check the coolant level and top it off if necessary.
11. Check for leaks and squeeze upper and lower radiator hoses: Make sure there are no leaks and that the hoses are pliable.
12. Replace the radiator cap: Securely replace the radiator cap.
13. Dispose of old coolant properly: Coolant is hazardous waste and should be disposed of at a designated auto parts store or recycling center. Do not pour it down the drain or onto the ground.
Important Notes:
* Consult your owner's manual: This guide provides general instructions. Always consult your owner's manual for specific instructions and torque specifications for your 1999 Saturn SL2.
* Bleeding the system (if needed): If you have air bubbles in the system, you may need to bleed the system. This usually involves opening a bleed valve (if equipped) and letting air escape while adding coolant. Your owner's manual will provide details on this process if necessary.
* Consider professional help: If you are uncomfortable performing this task yourself, take your car to a qualified mechanic.
This detailed guide should help you successfully change your 1999 Saturn SL2's engine coolant. Remember to prioritize safety throughout the process.
