changing cabin air filter that wasn't maked to be changed on 2005 Dodge Caravan

have grand caravan & tried to change cabin air filter but only "select models" are changeable...can I cut bottom of unit and retro-fit a filter. car is in Fl. and smells like an old frig.

1 answer
Replacing the filter will not get rid of that smell, which is in the A/C unit.