Water keeps coming out of my resavor when it starts to heat up
from what you describe either a bad radiator cap, or a leak in the small hose going to the resovoir,or the line within the resovoir tank is to short or missing,this is whats happening,engine warms up to a point that the cooling system is building pressure,the radiator cap has a set presure release to it you might see the figure direcly on top of the radiator cap, 12-14 lbs rated. it usualy will read something like that, so as that warming engine builds pressure in the cooling system it will eventualy surpass the rating of the radiator cap ,and out it goes and flows in that small line to the overflow resovoir. now when the engine cools back down it now will create a vaccum and should draw that water back from the resovoir to the radiator,but if the hose or hardline that is usualy integral within the resovoir is bad cracked or missing, it would be the same as trying to drink a soda through a straw,but the straw is not inserted below the surface of liquid.or if the straw was cracked, no fluid can be vaccumed up through the straw, the resovoir works on that same principle, it must have a good unobstructed line from radiator to the resovoir,and the line inside the resovoir should go nearly to the bottom of the tank, so the water can be vaccume syphoned out just as drinking a soda with a straw.so check to be sure the line is all good no obstructions,no cracks, and that there is a line that continues within the resovoir tank almost to the bottom as well and it is in good shape as well. last check that radiator cap to make sure the rubber as well the upper gasket portion are still there and not cracked/dryrotted. if all that is in good working order then your radiator should be able to recover the water back.just like sippin a soda through a good straw
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