Usually sa mga vans ay 1.5 kg na freon ang karga. If the A/C is not working before, have a leak test before charging. The system will be filled with compressed air to about 200 PSI, leak test, repair if necessary, vacuum the system for at least 30 minutes before charging.

Me pekeng freon na kumakalat, look for genuine freon. Maraming A/C tech that replace the expansion valves and filter/drier once the system is opened for repair which I think is a valid practice to prevent backjobs and freon waste, although some freon could be recovered.

The price of expansion valves may range from P600 to about P1500, filter/drier is about P200.