If the compressor is running and cool air is functional even a little, there is freon in the system.

You can use R12 gauge on your home ac... If it is r22... NOT IF IT'S R410! If it's 410, you can ONLY hook to the low side... The high side can damage R12 gauges.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!