In hot conditions the coolent from rad is pushed into the resivour. The rad and thermastat are new.
that what it is supposed to do...
and when it cools down/needs it, it takes it back..
exactly if you are losing excess amounts of fluids out the overflow though when it gets hot and builds pressure it pushes out alot where it over flows out the bottle and then pulls back almost every thing in the bottle then I would look at getting a new cap. the one on the truck might be weak allowing it to open at a low pressure.
Cap is new.
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