My 93 Toyota Dlx pickup was losing water from the cooling system and could not find the leak even used dye in the coolant and used a pressure tester. The throttle body coolant hoses had been changed and just did not know there was the the u-shaped hose from under intake to back of timing cover. Very tough to see this hose more feel by hand i know there is a joke in there somewhere....lol and a major pain to get at. Here is a picture of the PIA hose.
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