Here's how to do it:
1. Locate the drain petcock: This is usually a valve located at the bottom of the radiator, often on the driver's side. It's typically a small brass or plastic valve with a threaded plug or a lever.
2. Prepare for draining: Place a large container (at least a gallon capacity) under the radiator drain petcock to catch the coolant. Make sure the container is large enough to hold all the coolant in the radiator. You might also want to place some old rags or towels around the drain area to catch any spills.
3. Open the drain petcock: Carefully open the petcock. This might involve turning a valve or unscrewing a plug. Do this slowly to avoid splashing. The coolant will flow out relatively quickly at first.
4. Open the radiator cap (optional but recommended): Once the flow from the petcock slows significantly, consider opening the radiator cap (after the engine and coolant have cooled completely!). This will allow for more complete draining of the coolant from the radiator. Always relieve pressure in the system before opening the cap if the engine has been recently run. Do this by slowly unscrewing the cap slightly at first, allowing pressure to escape before fully removing it.
5. Wait for complete draining: Allow sufficient time for all the coolant to drain from the radiator.
6. Close the drain petcock: Once the draining is complete, carefully close the drain petcock. Tighten it securely.
7. Dispose of coolant properly: Coolant is toxic and should be disposed of responsibly. Check with your local waste disposal facility or auto parts store for proper disposal methods. Many auto parts stores will accept used coolant for recycling.
Important Considerations:
* Engine Block Drain: The radiator only drains the coolant *in the radiator*. To completely drain the cooling system, you'll also need to drain the coolant from the engine block. This usually involves a drain plug on the engine block itself. The location varies depending on the engine type, so you'll need to consult your owner's manual or a repair manual for your specific Roadmaster's engine.
* Flushing the System: If you're replacing coolant, consider flushing the system to remove old, contaminated coolant. You can do this by running water through the system after draining.
* Refilling: After draining and flushing (if applicable), refill the system with the correct type and amount of coolant as specified in your owner's manual. Use a 50/50 mix of coolant and distilled water. Always bleed air from the system after refilling.
Disclaimer: This information is for general guidance only. Always consult your vehicle's owner's manual for specific instructions and safety precautions. If you're uncomfortable performing this task yourself, it's best to take your vehicle to a qualified mechanic.
