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Could be a leak in a radiator hose, or radiator. ==Answer 2, Another Possibility== It could also be the radiator cap pressure relief valve action which vents coolant and/or coolant vapor to the coolant overflow reservoir/tank when steam is created in the coolant passages in the engine block. When the engine is shut off, the residual heat in the block can cause the additional pressure and/or steam.j3h.

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βˆ™ 2007-02-14 12:20:51
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Q: What could be the hissing sound that comes from under the car when the engine is turned off after a drive?
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