Most likely the Freon needs filled "as you know" and the compressor will need manually engaged to get this started. If you open the fuse box by the battery and locate your AC Relay. You can use a jumper wire to manually turn on the compressor with the AC Switch pressed inside the car and the setting at the coldest level. Find the positive relay pin to the negative with the jumper wire. Take off the valve stem cap and plug in the Freon hose and pump it in till it is entirely empty (shake the can up a bit before doing this and turn the can upside down when filling). Hope this helps.