Product Overview The Upper Radiator Hose JLM21499 is an OE-grade cooling system component engineered for select for Jaguar vehicles equipped with the 3.0L AJ-V6 naturally aspirated petrol engine. This flexible rubber hose connects the engine to the radiator, allowing hot coolant to flow from the engine to the radiator when the thermostat opens. Manufactured to original equipment specifications, JLM21499 is a direct replacement for worn, cracked, or swollen hoses – restoring