I have traced a water leak to the top of the engine under the intake manafold??? on 1993 Toyota T100

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It seems to be in the tunnel between the intake manifold and the engine. I was unaware that there was any water on top of the engine. Is it to preheat the gas before injection?
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Coolant tube , behind water outlet on front. O-rings failed. Check knock sensor harness while in there.
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