[ImperialCrown]

Welcome to Allpar. They were a replaceable filter until 1983, then they were a sealed unit with no service other than canister replacement.
Since this is an '89 AC body NYer, it may be moved to the EEK! secion for FWD NYers.

 

[Bob Lincoln]

+1. Not serviceable except by replacement. Those filters are for canisters from 1970s up to early 1980s. Those canisters were open at the bottom, and you tucked the filter into the bottom.