โข Presence of air or exhaust gas in coolant accelerates corrosion of the cooling system components. To prevent this, carry out air/ gas leakage tests in accordance with the following procedure.
โข Remove the pressure cap.
โข Run the engine until the coolant temperature rises to approximately 90ยฐC.
โข If air bubbles appear continuously through the filler port, there is air or exhaust gas penetrating into the cooling system.
โข Presence of air in coolant can be an indication of loose cylinder head bolts, loose water pump mounting bolts, loose hose connections, and/or a damaged hose.
โข Presence of exhaust gas in coolant can be an indication of a damaged cylinder head gasket and/or cracks in the cylinder head.
