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we check for gases in the cooling liquid when the engine is heated. the cylinder head is broken. the first symptoms when it starts to break through are airing of the cooling liquid system, because of this the thermostat may not open due to air in the system, and the fan on the radiator does not work, the relay does not work. since due to air in the system the radiator does not heat up, and slowly throws out the cooling liquid from the expansion tank. when accelerating at high speeds the pipes inflate and become rigid.