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I have had instances where the shcrader valve was not depressed fully by a set of the newer, anit-blow back valves on the gauges.
In this case, I just use an adapter off of another gauge set.
Be sure he is charging from the low pressure port.
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Benzmac:
Donnie Drummonds
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS
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