Cooling System
The engine coolant level is controlled or maintained by the recovery system. The recovery system components are the expansion tank, pressure cap, and connecting hose.
As coolant operating temperature increases, the coolant expands which builds pressure in the system. The coolant level in the bottle may rise. As coolant temperature decreases, the coolant contracts and relieves the pressure in the system.
Some coolant level drop on new vehicles is normal as the system is purging itself of trapped air. Observe coolant levels and maintain as recommended by adding coolant to the expansion tank.