Automotive manufacturers use spring-lock couplers to connect A/C lines quickly during assembly. These connections have a garter spring inside a flared housing that grabs a ridge on the male pipe. To pull them apart, you need a disconnect tool. The tool is a split plastic collar that wraps around the line. You push the collar inside the coupling, which spreads the internal garter spring wide enough to slide the male line out.
Trying to pry these couplers open with screwdrivers will bend the aluminum lines and scratch the sealing surface. This guarantees a refrigerant leak when reassembled. Clean any road grit out of the coupling before inserting the tool. If dirt blocks the spring from expanding, the tool will crack.