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Old 04-14-2020, 04:54 PM   #4
Mark114

 
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Drives: 2016 2SS Convertible
Join Date: May 2012
Location: St. Louis, MO
Posts: 1,780
That seems unusual. The radiator cap will let the system pressurize but I don't think it should allow a vacuum to form. Under vacuum the system should draw fluid from the reservoir which isn’t sealed. You might want to have the cap checked.
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