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High pressure in a car's cooling system might be caused by exhaust gases from normal engine combustion entering the cooling system. The exhaust gases might be entering the coolant due to a head gasket that is leaking, or perhaps even due to a cracked engine block. Note that under normal operation, cooling systems are pressurized due to the heat expansion of the coolant. However, if a fairly new radiator and/or hose has burst, or if the coolant hoses connecting to the radiator are rigid with pressure, this is abnormally high pressure.

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Q: What can cause high pressure in the cooling system of a Saturn?
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