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Old 04-14-2020, 05:27 PM   #5
caSStro18
 
Drives: 2018 Camaro SS
Join Date: Sep 2019
Location: California
Posts: 564
Quote:
Originally Posted by Mark114 View Post
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.
Yes. Most likely the radiator cap is the culprit. Because, that ain’t normal!
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