Air trapped in the cooling system could create undesirable areas of combustion heat buildup in the engine called .

Air pockets.

Explanation:

Air pockets in the cooling system are bubbles of air trapped within the lines (hoses and pipes) of the cooling system. This air bubbles enter the cooling system usually during the process of filling the radiator coolant fluid (usually water), or replacing the water pump or the radiator hose during repairs or servicing of the cooling system. The trapped air prevent pressure movement that is needed by the coolant to move the heat generated from the engine cylinder, resulting in heat build up. The solution is to "bleed" the engine through the radiator lid or some air release valves.

Explanation:

As we know by the formula of elasticity we will have

if we compare this equation by the spring force we will have

so we will have

now we know that maximum compression in the bone will be given as

now the energy stored in the bone is given as

Now we can say that maximum initial energy must be equal to this energy