Volkswagen Jetta Air Conditioner Recharge

Bought The Car With The A/c System Totally Empty. I Used My Vacuum Pump To Vacuum It Down. I Only Got It To 20. The Next Day, The Vacuum...

Took My Car To The Dealer For A New Battery. They Performed A Battery And Charging System Test. I Have No Warning Dash Lights Or Signs Of A...

Tried To Recharge A/c Myself...wouldn't Work. Took It To Two Auto Shops...still Wouldn't Work. One Shop Replaced The Expansion Valve..no...