93 850 AC NOT WORKING---HELP

[2volvoken]

IT'S GETTING WARM HERE IN INDIANA. MY AC WON'T WORK. WHEN TURNED ON THE AC CLUTCH DOES NOT EVEN ENGAGE. CAN THIS BE CAUSED BY A LOW 134A CHARGE? CAN I RECHARGE IT? AND WHERE IS THE PORT TO RECHARGE LOCATED. THE ONLY ONE I SEE IS UP CLOSE TO THE FIREWALL AND IS MARKED MAX.6NM. THANKS 2VOLVOKEN ALSO, JUST CHECKED, THE CLUTCH DOES NOT ENGAGE WHEN I PUT SELECTOR IN DEFROST MODE EITHER.