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i am just catching up here. Is your heater core leaking or just it hoses or control valve?
How much water in the last top off? Also it should be a coolant mix. In your environment water is going to boil off fast.
reservoir cracked on the bottom side? Fill it up, grab a few sodas, start it and make a day out of watching it.
Hahaha, no it's not cracked and for the first time since I had this truck the water still there I just checked it out I hope it will last more soon I am going on a road trip for about 900km