Decrease of the liquid level in the reservoir tank and antifreeze runs indicate the leakage in the cooling system.
Small cracks, gapping of pipe line and flanged lips joints, other reasons of leakage can be eliminated with the help of special agents introduced into the cooling liquid. Active components of such agents are polymers, which fasten in the places of leakage and stop leaking.
By warm engine the antifreeze is under pressure in the cooling system. Be careful when opening the radiator cap (expansion tank cap): hot vapour or liquid may erupt.