Quote:
Originally Posted by evilokc
yesterday while driving I had some steam coming from under the hood and `some coolant hitting my windshield. I was immediately terrified. I pulled over to find coolant spewing from the rad cap. my motor was covered. luckily tightening the cap cured the issue but I was concerned about how much coolant I had lost and the motor was to hot for me to remove the cap to check. took it back home and parked it. later in the evening I checked the level and it just at the edge of the top fins. so no real harm besides the mess. added some coolant and ran the motor until the thermostat opened to make sure I had antifreeze in the motor. no leaks that I could see but im keeping an eye on it. just about ready to get the passenger fender back on.
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Sounds normal for a loose radiator cap. When the system is under pressure the boiling point goes up about 3 degrees for every pound of pressure. (E.g., if there's 10 psi, straight water, it won't boil until it reaches around 242 degrees.) If there's no pressure, straight water will, of course, boil at 212. A 50-50 mix of antifreeze and water boils at a slightly higher temperature than water, but you get the idea.