Reverse Flushing: Notes
WARNING: This page is about a different car, the 2015 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
The cooling system normally operates at 97-124 kPa (14-18 psi) pressure. Exceeding this pressure may damage the radiator or hoses.
Reverse flushing of the cooling system is the forcing of water through the cooling system. This is done using air pressure in the opposite direction of normal coolant flow. It is usually only necessary with very dirty systems with evidence of partial plugging.