Here's a general procedure. Specific locations of valves and drain plugs may vary slightly depending on the exact engine (5.7L, 6.5L diesel, etc.) so consult your owner's manual for precise locations and diagrams:
1. Gather your tools: You'll need a large drain pan (at least 5 gallons), a wrench (likely a 10mm or 12mm depending on the drain plug size), rags, and possibly a funnel if you're refilling immediately.
2. Locate the radiator drain plug: This is usually located at the bottom of the radiator, typically on the driver's side. It's a small plug, often with a hex head.
3. Position the drain pan: Place the drain pan under the radiator drain plug to catch the coolant.
4. Open the radiator cap: Carefully open the radiator cap SLOWLY to release pressure. If it's difficult to open, wait longer for the engine to cool. Point the cap away from your face as some coolant might spray out when releasing the pressure.
5. Open the drain plug: Use the appropriate wrench to carefully loosen and remove the radiator drain plug. Let the coolant drain completely into the pan. This may take some time.
6. Close the drain plug: Once the coolant has drained, replace the drain plug and tighten it securely, but do not overtighten.
7. Reinstall radiator cap: Reinstall the radiator cap once the drain is complete.
Important Considerations:
* Coolant Type: Note the type of coolant used (usually indicated on a sticker under the hood) so you can replace it with the correct type. Mixing coolant types can be detrimental to your cooling system.
* Other Drains: Some vehicles also have a drain plug on the engine block. Consult your owner's manual to determine if your Suburban has one and how to access it. Draining this will remove more coolant from the system.
* Flushing (Optional): For a more thorough cleaning, you might consider flushing the cooling system. This involves running water through the system to remove old coolant and debris. There are many resources online explaining this process.
* Refilling: After draining, you'll need to refill the radiator with the correct type and amount of coolant. Consult your owner's manual for the proper coolant capacity. Often, a 50/50 mix of coolant and distilled water is recommended. Make sure to bleed any air bubbles from the system after refilling. Failure to do so can result in overheating.
Safety Precautions:
* Coolant is toxic: Wear gloves and eye protection when handling coolant. Avoid skin contact and ingestion.
* Hot surfaces: The engine and radiator may remain hot even after the engine has been turned off. Allow ample time for cooling before working on the vehicle.
* Dispose of coolant properly: Coolant should be disposed of at a recycling center or auto parts store that accepts used automotive fluids. Don't pour it down the drain or into the garbage.
This information is for general guidance only. Always consult your 1999 Chevy Suburban's owner's manual for specific instructions and diagrams relating to your vehicle's cooling system. If you're uncomfortable performing this task yourself, take your Suburban to a qualified mechanic.
