Toyota Wont Start on 1990 Toyota 4Runner

My toyota over heated slightly, one morning, I went out after letting it cool would not start. Found water in the nmber 5 & 6 cylinders. What would cause this and how can I fix it. Thank you

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2 answers
If there is water in the two cylinders you have a blown head gasket and it needs to be repaired by a repair shop, Don't try and start the engine as if it starts and the affected cylinders have too much water or coolant in them you will bend a connecting rod or break a piston because water will not compress like a fuel air mixture.
their was a recall for this model cylinder # 5 and 6 check if u ever got a recall form toyota, if not call and give them ur vin# and they can check it.