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Discussion Starter #1
i went to check my coolant level today on my 03 deville after the car was sitting 24hrs and when i removed the cap there was a pop, the system had pressure in it after sitting 24hrs, the car runs fine with no overheating issues, i removed the small line coming off the tank and was able to blow thru it with my mouth, why would it be pressurize after sitting 24hrs???
 
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