A belt or hose failure can cause an overheated engine, loss of power steering, and loss of the electrical charging system. If a hose leaks coolant or the belt turning the water pump snaps, the cooling system is inoperable. If the engine overheats, it can suffer serious internal damage that requires expensive repairs and can ruin a summer vacation.
Overheating can occur anytime, but usually happens in the summer. Underhood temperatures are much higher, and heat can trigger or accelerate deterioration of rubber compounds.
The most damaging cause of hose failure—electrochemical degradation (ECD)—isn't easy to detect. ECD attacks hoses from the inside, causing tiny cracks. Acids and contaminants in the coolant can then weaken the yarn material that reinforces the hose. Eventually, pinholes can develop or the weakened hose may rupture from heat, pressure, or constant flexing.
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