On my 2003 Kia Sedona minivan, the air conditioning recently stopped working. This occurred somewhat gradually over the course of a week or so.
I noticed today that if I turn the air conditioning on, I can hear a hissing sound which seems to come from the center of the console, or near the passenger side.
No noise occurs with just the blowers, and noise is consistent no matter what blower speed. After turning off the air conditioner, the hiss doesn't stop immediately, but takes a few seconds before going away, even after I hear the compressor disengage. The recirculating selector has no effect on the hissing sound at all.
Do I simply need to get the refrigerant recharged, or are there other things I should be looking at?