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The spring rad cap only keeps stuff in the radiator until the coolant gets hot enough (i.e. high enough pressure) to force its way past. The reverse is also true - coolant will only "return" to the rad until it cools enough that the spring closes it up again.
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2002 Mazda Protege ES, mildly-modded daily driver
1990 240S R - the DET has landed.
Kent's Funkay Disco
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