are you referring to the pressure valve? it should be located under the hood behind the headlamp.
AC system faults usually cause cars to be stranded so you may also seek the help of a qualified Volvo technician if you feel that your car had a serious problem.
i need to recharge the system and i cant fine where the conection are
I recommend that you refer to the service manual of your car. It can provide you also with additional info regarding your AC system. It should help you with the specifics including the wirings.
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