1. Locate the coolant drain plug. On a Massey Ferguson 35, it will be at the bottom of the radiator on the side nearest the engine.
2. Place a suitable container below the drain plug to catch the coolant.
3. Unscrew the drain plug using a wrench.
4. Let the coolant drain out of the radiator completely.
5. Replace the drain plug and tighten it securely.
6. Fill your Massey Ferguson 35 with the appropriate mixture of coolant and water.
7. Check the coolant level in your Massey Ferguson 35 regularly and top up as needed.