An easy check when the engine is cold is to start the car with the radiator cap off. Make sure its topped of and crank the motor, If water shoots out of the radiator then its for sure a BHG. water shooting out means compression from one or more pistons is entering the cooling system. This type of BHG will in a short time over pressurize your cooling system and force the water and coolant out of the cooling system, overfill the catch tank and soon the engine will overheat.
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