The pickup for the A/C would be fairly far back. I my 2800, it was only about 8" form the transom in the engine compartment. You should see a seacock, then the hose from the Seacock goes into the Sea Strainer. From the sea strainer, a hose will go into the AC pump. Then from the A/C pump up to the A/C unit itself.
There is no 'filter'. It is just a cylindrical stainless steel screen. You would absolutely want to make sure you closed the seacock before you opened the service port on the top of the seastrainer to clean the ss screen. If there are tears in the strainer screen, then replace it.
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