There's a few possibilities here..
It does not have a cabin air filter if that is what you are looking for.
The 1997 Dodge Neon air conditioning recharging port can be found on the top of the air conditioner compressor. The low pressure port will be labeled as such.
If you mean leaking water in the car then the drain is probably stopped up.
You need to find and repair the vacuum leak.
(I recommend you take it to a garage as if you get too much in it you can lock the compressor or it won't cool right .
Check first that something hasn't gotten into the vents. Sometimes things left on the dash board drop into the vents and make noise as the air passes over them. Also some of the air fresheners people plug into the vents may make a little noise. It is also possible that the compressor in you ac system is starting to fail.
No, a 1997 Dodge does not have a cabin filter.
A 1997 Dodge with a Cummins diesel does not have an oxygen sensor.A 1997 Dodge with a Cummins diesel does not have an oxygen sensor.
A 1997 Dodge Dakota does not have an EGR Valve.
A 1997 Dodge Ram does not have EGR.
A 1997 Dodge Ram did not have EGR.
timing belt broke n changed it now bottom crank doesnt turn all way round it s hitting something on a dodge caravan 2000 3.0