Was the spot centered under the radiator or to the right or left? Mine for example has an overrun hose the left facing the front of the car and that would indicate that the engine is getting excessively hot or there is too much fluid in the radiator. With the engine cool check the level of coolant in the radiator to see if it is now low. You might want to keep an eye on the temperature reading for now unless you can find a leak from another source and then you should get that repaired immediately.

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