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Old 04-02-2003, 01:33 PM
Jim Anderson Jim Anderson is offline
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Join Date: Jun 2000
Location: Saugus, CA USA
Posts: 2,007
I've run cars without the radiator cap cause of leaking under pressure, it works just fine, just have to worry about coolant splashing out. I had an old cap and tore the rubber washer out. I'm guessing you loose maybe 10% of your peak cooling capacity with no pressure.
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