To avoid problems resulting from rust, dirt and mineral deposits in the cooling system, it's best to give it an internal cleaning every year or two.
It's easy. Here's how:
- Begin with the engine cold and ignition off. Remove the radiator pressure cap.
- Open the petcock at the bottom of the radiator and drain the coolant into a bucket.
- Close the petcock and fill the radiator with water.
- Start the engine and turn the heater control to hot. Add cooling system cleaner and idle the engine for 30 minutes (or as per the instructions on container).
- Stop the engine and allow it to cool for five minutes. Drain the system.
- Close the petcock, fill the radiator with water and let the engine idle for five minutes.
- Repeat step No.5. Close the petcock.
- Install new 50/50 mixture of water and ethylene glycol antifreeze/coolant.
Courtesy of the Car Care Council