Reverse Flushing: Notes
CAUTION:
The cooling system normally operates at 97-110 kPa (14-16 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 in the reverse direction of normal flow. This is done using compressed air and water. It is usually only necessary when the cooling system is extremely contaminated and evidence of partial plugging is evident.