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air conditioning system faulty on 2006 Acura RL

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I have replaced the a/c compressor, expansion valve and the condenser but still the a/c system will not take charge/freon. Can anyone help?
(1) Answer
When you say that it will not take a charge, do you mean that you can not add R-134? If so, I would disconnect the system and use compressed air to check for restrictions. You could have a plugged up receiver dryer which is basically a filter etc. Make sure that you can blow air through all parts of the system , except the compressor, which has check valves and is new, so it should not be a problem.