2011 JAGUAR XJL Engine Problems

MY JAGUAR DISPLAY COOLANT FLASHED AND STATED THAT THE COOLANT LEVEL WAS LOW. SO ON SATURDAY MORNING I CHECKED MY JAGUAR COOLANT LEVEL RESERVOIR AND SURE ENOUGH MY COOLANT WAS VERY LOW. I ALWAYS KEEP A GALLON OF COOLANT ON HAND IN MY GARAGE. SO I TOPPED OFF THE RESERVOIR WITH THE WHOLE GALLON OF COOLANT AND LEFT FOR THE DEALERSHIP. NOW PENSKE JAGUAR AND LAND ROVER WHICH IS ABOUT 14 MILES FROM MY HOME. SO I GOT ON THE 405 FWY SOUTH TO THE 710 LONG BEACH FWY NORTH TO THE 91 FWY SOUTH TO THE 605 FWY SOUTH EXCHANGE TO THE SOUTH STREET EXIT TOWARDS THE DEALERSHIP. BUT DURING THE EXCHANGE TO THE 605 FWY SOUTH MY JAGUAR COOLANT LIGHT IN THE DASHBOARD CAME ON STATED THAT COOLANT LEVEL IS LOW. SO LIKE YESTERDAY I ASSUMED THAT I COULD GO THE EXTRA MILE OR SO TO THE JAGUAR...