The time required to replace an AC compressor on a 2005 Nissan Altima can vary depending on several factors, including the mechanic's experience, the availability of parts, and the condition of the vehicle. However, as a general guideline, replacing an AC compressor typically takes around 3 to 5 hours of labor.
The process involves several steps, including discharging the refrigerant, removing the old compressor, installing the new compressor, recharging the AC system with refrigerant, and conducting tests to ensure proper functionality. Additionally, if there are other related components that need attention, such as the receiver drier or expansion valve, it may take longer to complete the job.
It's important to have a qualified mechanic or technician perform the AC compressor replacement to ensure that it is done correctly and to avoid any potential issues with the AC system in the future. Also, keep in mind that labor times can vary between different repair shops, so it's a good idea to get quotes from multiple places before proceeding with the repair.