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 TankExterior Lamp Controls
The exterior lamp control is on the turn signal lever on the left side of the
steering column.
There are four positions:
(Headlamps): Turns on the headlamps
together with the parking lamps and instrument panel lights.
(Parking Lamps): Turns on the parking
lamps including all lamps, exce ...
Fuel
Use of the recommended fuel is an important part of the proper maintenance of
this vehicle. When driving in the U.S. and Canada, to help keep the engine clean
and maintain optimum vehicle performance, we recommend using TOP TIER Detergent
Gasolines.
See www.toptiergas.com for a list of TOP TI ...
How to Add Coolant to the Coolant Surge Tank
Caution
This vehicle has a specific coolant fill procedure. Failure to
follow this procedure could cause the engine to overheat and be severely damaged.
If no problem is found, check to see if coolant is visible in the coolant surge
tank. If coolant is visible but the coolant level is not at t ...