So the blower motor doesn't work? if so check the link below.
blower motor does not work
Or the blower motor works but there is not very good air flow out the vents? If so it was pretty common on the older GM's for the evap core to leak and cause a bunch of debris/dust/dirt to stick to it causing airflow to slowly be limited as it became covered in dirt. Sometimes you can remove the blower motor and clean the evap core to regain some air flow.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
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