AC Compressor Repair How to Install: Mechanic Troubleshooting - Part 3 of 3 AC Compressor Repair How to properly install an AC Compressor for your Auto AC System. AC hoses, AC lines, ac condenser must be flushed properly and new car AC compressor is preferred for a good installation. All Every OEM and Aftermarket new AC compressor has a one year, unlimited mileage warranty and every AC Compressor ships for free.