The running pressure of a liquid-cooled engine is controlled by a?

Cars & Vehicles
Heating AC and Engine Cooling

Coolant pressure begins to rise above 0psi as coolant temp increases. The pressure cap on the radiator or elsewhere will contain this rising pressure until it reaches the preset spec. written on the cap. Then a relief valve opens, and coolant is vented to the overflow or the ground to maintain pressure. Usually about 15psi.

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GM just declared bankruptcy.

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