Need help Installing an A/C pump in 04 2500
#2
Typically, if you replace only the compressor, drain the oil out of the old one and measure it. Then drain all the oil out of the new one and measure. Refill compressor with the amount of oil that you drained out of the old compressor. If the compressor failed internally, it is highly reccomended that you replace the accumulator and oriface tube. Again, drain the oil out of those parts and measure and add fresh oil to replace.