Join Date: Jul 2003
Location: North Attleboro, MA
Rep Power: 0
Could be. When the car warms up the coolant in the cooling system expands and the radiator cap holds back some of that pressure to raise the boil over point of the coolant. If your cap is bad then it's not holding back enough of the water and letting it out into the overflow tank at too low of a pressure. Replace the cap and see what happens. Won't hurt anything.
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