You first pull a vacuum for 30 min. and then hold it for 10. If it looses less than 2 inches of merc, you fill it through the port on the low pressure hose (big hose on top). Then add your refrigerant.

------------------
Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM