I had an A/C repairman look at my furnace/blower because the air flow would stop after the thermostat would kick on the A/C. After I turn the A/C for a long time, the air would flow again, but then stop.

I suspected the A-frame in the coil was freezing up on me, and that I probably only needed some refrigerant.When the A/C guy looked at it though, he said I needed a whole new coil for (a price of $900!!!). He said there was a leak in the coil and showed me some slightly rusted areas and some water on the coil base...but isn't this normal when the A/C is running to have some condensation?

He put some more refrigerant in the compressor and now it works fine without the air stoppage. Should I call the guy back to fix the coil or not? Any input would be greatly appreciated.