Why is there coolant on my coil ignition starter?

My engine light came on when my car was miss firing. Coil 1 was bad . Went to replace it, when I pulled coil out coolant was all inside.

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Please give us a make and model number and year, thanks

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2011 Nissan sentra SL 2.0L

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I don't know much about modern Japanese cars, but I have worked on multiple old German cars. Let's see if I can help. Is there any radiator hoses running over where the coil is?

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