The vehicle must be on a level surface when checking the coolant level.
It is normal to see coolant moving in the upper coolant hose return line when the engine is running.
Check to see if coolant is visible in the coolant surge tank. If the coolant inside the coolant surge tank is boiling, do not do anything else until it cools down.

If coolant is visible but the coolant level is not at or above the mark pointed to, add a 50/50 mixture of clean drinkable water and DEX-COOL coolant.
Be sure the cooling system is cool before this is done.
What to Use
How to Add Coolant to the Coolant Surge TankWindows
Warning
Never leave a child, a helpless adult, or a pet alone in a vehicle,
especially with the windows closed in warm or hot weather.
They can be overcome by the extreme heat and suffer permanent injuries or even
death from heat stroke.
The vehicle aerodynamics are designed to improve fu ...
Instrument Panel
Air Vents on page 8-3.
Exterior Lamp Controls on page 6-1.
Horn on page 5-2.
Instrument Cluster on page 5-8.
Windshield Wiper/Washer on page 5-3.
Infotainment on page 7-1.
Information Display.
Hazard Warning Flashers on page 6-3.
Instrument Panel Illumination Control on page 6 ...
Malfunction Indicator Lamp
A computer system called OBD II (On-Board Diagnostics-Second Generation) monitors
the operation of the vehicle to ensure emissions are at acceptable levels, helping
to maintain a clean environment. The malfunction indicator lamp comes on when the
vehicle is placed in ON/RUN, as a check to show ...