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Not sure maybe a rubber gasket was not holding so after I pulled a vacuum it sucked back in air afterwards.
All I know was when I took yo an AC shop to charge they had no problems doing it. Which led me to believe it was either the gauge or my vacuum pump. I replaced gauge first and that was it.
I was hitting 400psi after only 1.5 cans! And the system needs about 2.5 cans roughly.
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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k
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