Hi George,
Ok, are you sure that it is low on freon? If you are and since the system is empty or empty enough that the compressor wont come on you can before starting the vehicle hook up your hose to the low side and then start the vehicle and open the can once system is full enough the compressor will kick in then just fill it till the gauge reads correct pressure.
I have done this many time with no problems.
Mark
Thursday, May 15th, 2008 AT 10:11 PM