A/C Compressor Change, Oil-Related Questions?

Swapping out the A/C compressor in your 1965 Ford Mustang for a serpentine belt-driven unit is a significant upgrade, and you've raised some essential questions about the oil requirements during the process. Let's address each of your questions:

Question #1: Yes, it is crucial to measure and transfer the correct amount of oil from the old compressor to the new one. The oil in the A/C system is necessary for lubricating the compressor and other components. Having the right amount of oil ensures proper lubrication and helps prevent damage to the compressor due to insufficient or excessive oil.

Question #2: Mixing different types of PAG oils is generally not recommended. While PAG oils are compatible with each other to some extent, it's best to avoid mixing them, as different PAG viscosities can affect the performance of the compressor and the A/C system. If your old compressor uses PAG 100 oil, and the new one comes with PAG 68 oil, you should drain the PAG 68 oil that comes with the new compressor and refill it with the same PAG 100 oil used in the rest of the system. Mixing oils can lead to reduced cooling efficiency and potential issues.

To handle the difference in oil types, you should try to remove as much of the old PAG 100 oil from the system as possible. While you mentioned not doing a complete flush, it is advisable to drain and flush as much of the old oil from the system as you can to minimize the mixing of different oil types.

Question #3: Here are some additional points to consider regarding the oil:

Compressor Oil Capacity: Make sure to check the specifications for both the old and new compressors to determine the correct oil capacity for each. This will help you measure and transfer the appropriate amount of oil during the swap.

Oil Disposal: Properly dispose of any excess oil that you drain from the system. Environmental regulations may dictate the appropriate method of disposal for used compressor oil.

System Flushing: If you have concerns about mixing PAG oils, consider performing a more thorough system flush to remove as much of the old oil as possible before installing the new compressor. This will help minimize the risk of oil mixing.

It's important to note that A/C system work can be intricate, and having the correct tools and knowledge is crucial to ensure a successful swap. If you're unsure about any step of the process or handling the oil, it's best to consult with a professional A/C technician or an automotive expert who can assist you with the compressor replacement and ensure the proper handling of the oil.

As a final reminder, always prioritize safety and follow the manufacturer's instructions and guidelines for the specific components you're working with. Good luck with your A/C compressor swap and serpentine belt conversion!

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