2. The condition of the hoses can be determined by squeezing them. Hard, porous or cracked hoses should be replaced immediately.
3. Are the hoses tightly seated on the connecting pipes?
4. Are the hose clamp clamp bolts tight? They may come loose while driving and at full operating pressure in the cooling system. Replace rusted clamps.
At engine operating temperature, areas of wear and damage to hoses can be identified by squeezing the hoses tightly
(This article was copied from the website: audimanual)