Do A/C Compressors Come Pre-Filled With Fluid?
Yes—all A/C compressors come prefilled with the necessary refrigerant oil from the manufacturer. This ensures the compressor is protected from damage during initial startup and is ready for installation in most situations.
However, because every vehicle’s A/C system may require a specific and precise amount of refrigerant oil, we strongly recommend purchasing extra A/C compressor oil and measuring the exact quantity your system needs. During installation, some components may still contain residual oil, while others may have been completely drained during repairs.
By verifying and adjusting the oil level before installation, you can:
Ensure the compressor has the correct amount of lubrication
Prevent potential long-term damage
Maximize cooling performance and system longevity
In short: compressors do arrive prefilled, but double-checking and topping off if needed is the best way to protect your A/C system.