1. Park the car on level ground and ensure that the engine is turned off and has had enough time to cool down.
2. Open the bonnet/hood of the vehicle to access the radiator.
3. Locate the radiator cap on the radiator itself, which is usually a round, black plastic cap with the manufacturer's logo or "Radiator" labeled on it. In some models, there might be a secondary outer plastic cap that needs to be removed first before you get to the actual radiator fill cap.
4. Remove the radiator cap by carefully turning it counterclockwise until it can be lifted off. Be cautious as there may be residual pressure in the cooling system, so remove the cap slowly to avoid any hot coolant or steam escaping.
5. Look inside the radiator to check the coolant level. The coolant should be between the "Full" and "Add" marks on the radiator's side or an overflow tank nearby.
6. If the coolant level is low, you can start adding a mixture of 50/50 coolant and distilled water to bring the level up to the "Full" mark. Use the type of coolant recommended by your vehicle's owner's manual, which usually specifies a specific Jaguar-approved coolant or an equivalent.
7. Replace the radiator cap by aligning it with the threads on the radiator filler neck and gently turning it clockwise until it is snugly tightened.
8. Close the bonnet/hood.
9. Start the engine and let it run for a few minutes to allow the coolant to circulate. Keep an eye on the coolant temperature gauge on your dashboard to ensure it stays within the normal operating range.
10. You may need to check and adjust the coolant level again after the engine has cooled down.
Remember to follow your vehicle's owner's manual or seek assistance from a qualified automotive professional if you have any doubts or questions during this process.
