Installing car air conditioner parts can be very difficult. Critical parts such as a condenser, evaporator and compressor are often hard to get to, and replacing them requires topping up the coolant, knowing which type of coolant to use and knowing how to test the system for leaks.
Testing for leaks alone is a very technical process that requires a high level of skill and accuracy. Apart from the major components mentioned, a car's air conditioning system also includes a number of hoses, valves and tubes. To test for leaks, a technician needs to pressurize the entire system using special tools, while handling dangerous chemicals such as nitrogen. Overall, the task of installing car air conditioner parts is best left to a professional.