First a vacuum pump should be used to remove air and moisture from the system. It takes about 20 to 30 minutes. Then he should charge the system with 2.2 lbs of R-12. No A/C system will turn the compressor on without proper pressure. May I suggest that you stay away from that mechanic? He has no idea how the A/C system works. Hope this helps. Tom Niemczewski tomcio@xxxx vin 6298 ----- Original Message ----- > Last week, we changed the A/C compressor's seals to get it air tight. > > When completed, we brought the car to an A/C shop to replenish on R12 (I know it is expensive...) > But after trying to load the gaz, the mechanic stopped because the compressor would not start, and he could not mesure the pressure without the compressor starting... > > The problem is that the compressor would not work without gaz pressure... So the mechanic refused to replenish the system! > > > So what is the usual procedure to load R12 gaz after you emptied the system? > > > François Laplante > VIN: 17145