I think you're supposed to use an AC vacuum to draw the freon through the system. However you should also be able to trick the system by either shorting the sensor wires, or disconnecting. (Never tried it)
I acutally just jumped the compressor clutch directly with a couple wires to the battery, while the engine was running. The compressor had no choice but to pump the freon.
What system do you have? R12 or R134, or Puron
http://www.puron.com/generic/0,2804,CLI1_DIV114_ETI8735,00.html?SMSESSION=NO
Rumor had it that they would start putting it in cars, but the site above only talks about non-mobile systems.
I acutally just jumped the compressor clutch directly with a couple wires to the battery, while the engine was running. The compressor had no choice but to pump the freon.
What system do you have? R12 or R134, or Puron
http://www.puron.com/generic/0,2804,CLI1_DIV114_ETI8735,00.html?SMSESSION=NO
Rumor had it that they would start putting it in cars, but the site above only talks about non-mobile systems.