Magic Coolant, Its pulling a houdini... Options

[samir0189]

about 2 cups of coolant is disappearing every 200 miles from the radiator.

I have a brand new radiator that came with a new cap, i put new hoses. The overflow reservoir is remaining at the same level always. There are no leaks and no coolant is in the oil. . . .

Where is it going and if it is just "using" it, why is it not sucking back the missing from the reservoir? Bad radiator cap? Something else? Any help appreciated...

[97celiman]

i had a hairline crack where the round part for the cap meets the top plastic piece...it was hissing out and burning off before it hit the ground, i could smell it but couldn't see it...check those areas (top and bottom) for tiny cracks. if it just bubbles out it can burn off before it hits the ground

[samir0189]

i had a hairline crack where the round part for the cap meets the top plastic piece...it was hissing out and burning off before it hit the ground, i could smell it but couldn't see it...check those areas (top and bottom) for tiny cracks. if it just bubbles out it can burn off before it hits the ground

its a brand new all metal radiator.




UPDATE: ok so i've been topping off the radiator for a while now, and no changes to the system have been done. The reservoir has remained at the "full" level each time i've filled the radiator.

BUT yesterday, all of a sudden when i shut the car off, ALL the extra coolant I've been putting goes into the reservoir and then onto the floor when it filled up.

Where does it disappear to and why did come back with such a vengeance, and instead of gradually fill the overflow just dump it all at once?