What is the pressure in the system if evacuated? Significant negative pressure can make it difficult to remove the filter/drier. If you release the vacuum to make the filter/drier easier to replace, make sure to re-evacuate the system as soon as possible to avoid moisture getting into the new...
Once the hex is removed, the whole assemble will pull out with just a gentle tug. The filter itself is quite long. Soak the new filter with some PAG oil before installing it. The O-rings like a bit of oil too.
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