1. Disconnect the battery and turn off the air conditioning system.
2. Locate the heater core AC lines, which are usually located on the passenger side of the vehicle in the engine compartment.
3. Use a wrench to loosen and remove the nuts or bolts that hold the AC lines in place.
4. Carefully disconnect the AC lines from the heater core. Be careful not to spill any refrigerant.
5. Dispose of the old AC lines according to local regulations.
6. To reverse these steps, install new AC lines and connect them to the heater core.
7. Tighten the nuts or bolts that hold the AC lines in place.
8. Reconnect the battery and turn on the air conditioning system to check for leaks.
