The first gen Neons had the same problem, apparently moisture gathers in the ducting somewhere. One fix was to spray some lysol into where the air is sucked into the car (ie. by the windshield). I've been able to avoid this problem by always letting the fan blow for a few minutes before turning off the car. For example, if the AC is on and you're on the way home, just turn the regular fan on about 3 minutes before you get home. This trick has served me for 5 years. Might work for you.
Yeah DCX put a sponge in the grand cherokee to get rid of that and it ended up being worse when the sponge got mildewed since it wasn't an anti-bacterial sponge. The went to the trouble of fixing it and made it worse.....LOL
Oh and yes...this should work.
The lysol is just a trick to get rid of it quick.
There's a Glade auto freshner that goes right onto an air vent and whenever you turn that air up it produces the best air freshner smell I've ever experienced. It's called Glade Car Scented Oil - Vanilla Mist. http://www.glade.com/car.asp
Of course Mopar makes a spray for that problem but it's ridiculously priced at somewhere around 40.00 or maybe it was 75.00. Anyway the counter guy sais use lysol or something. Turn the air on full and spray at the air intake (outside vents below windshield) you will see the spray getting sucked in. Let it sit overnight. It works.
The best thing to do is to remove the evap fin temp sensor and spray in through there. Usually it's a build-up right in that area. You can get some aftermarket sprays from BG like frigi-fresh, and there is a few others. Here is part of an OLD Tsb for another vehicle that may help you. 4897625AA AND $41.00 IS LIST ON THAT STUFF. It'd be about $35 through us.
SUBJECT: A/C Evaporator Odor
DATE: Jul. 11, 1997
Some vehicle operators may experience a musty odor from the A/C system, primarily at start up in hot and humid climates. This odor may be the result of microbial growth on the evaporator core. During normal A/C system operation, condensation forms in and around the A/C evaporator. When airborne pollutants mix with this condensation, bacteria and fungi growth begins and odor results.
Operate the A/C system, if a musty odor is experienced, perform the Repair Procedure.
Quantity Part No. Description
1 04897625AA Cleaner, Aerosol Evaporator
This bulletin involves inspecting for leaves or other foreign material in the evaporator and HVAC housing and applying Mopar aerosol evaporator cleaner.
NOTE: FOLLOW ALL CAUTIONS AND WARNING SUPPLIED WITH THE AEROSOL EVAPORATOR CLEANER; KEEP OUT OF REACH OF CHILDREN; AVOID CONTACT WITH SKIN OR EYES; WEAR SKIN AND EYE PROTECTION, IF SKIN OR EYE CONTACT OCCURS, WASH SKIN OR FLUSH EYES WITH GENEROUS AMOUNTS OF WATER; AVOID BREATHING VAPORS.
Inspect the evaporator and HVAC housing for leaves or other foreign material that may be blocking the air flow through the evaporator. If the build up is excessive, replacement of the evaporator may be required.
With the parking brake applied and the transmission in Park, start the engine and let idle. Put the temperature control to full hot, blower speed to HIGH, select the PANEL and RE-CIRCULATE modes. Open all windows about 13mm (½ in.). Disable the A/C compressor clutch by disconnecting its wiring connector or the wiring connector to the A/C pressure switch.
NOTE: THIS PROCEDURE HEATS THE EVAPORATOR AND CAUSES MOISTURE TO EVAPORATE FASTER. THE SLIGHTLY OPEN WINDOWS ALLOW MOISTURE TO ESCAPE THE VEHICLE WITHOUT LOOSING MUCH HEAT. SOMETIMES, YOU MAY SEE A "FOG" CLOUDING THE WINDOWS. AFTER THIS "FOG" HAS DISAPPEARED CONTINUE TO OPERATE THE HEATER FOR ANOTHER 5 MINUTES. IF THE "FOG" NEVER APPEARED, OPERATE THE HEATER FOR A MINIMUM OF 30 MINUTES.
Turn the ignition switch to the OFF position.
Gain access to the evaporator cavity to apply the evaporator cleaner by:
AB, 1992 -93 AN, GS, JA, JX, LH, NS and PL - Remove evaporator fin temperature sensor access grommet. DO NOT REMOVE THE PROBE FROM THE EVAPORATOR.
BR, TJ, XJ, ZG, ZJ - Remove blower resistor.
For the above vehicles, place a piece of heavy masking tape over the opening in the evaporator housing where the fin temperature sensor access grommet or blower resistor was removed, then punch a small hole for the evaporator cleaner tube to be inserted into.
AA, AC, AG, AJ, AP, and AY - Remove the screw attaching the right side floor duct. Use an 1/8 in. drill bit to drill through the bottom of the screw hole, Figure 1.
1994-98 AN - Drill an 1/8 in. hole at the mid-point of the rounded corner created by the intersection of the vertical and horizontal surfaces of the HVAC housing, refer to Figure 2. Place tape around the drill bit to prevent the bit from entering the housing more a 1/4 in.
AS, ES - Remove the lower right instrument panel. Remove the blower motor cover. Make a template as illustrated below and drill an 1/8 in. hole as shown in Figure 3. Be sure to angle drill as illustrated.
Shake evaporator cleaner aerosol can well and insert the application tube in the access hole created in step 4.
NOTE: THE APPLICATION TUBE HAS A BLACK MARK AND A RED MARK ON IT INDICATING HOW FAR THE TUBE SHOULD BE INSERTED INTO THE EVAPORATOR CAVITY. THE RED MARK IS FOR AA, AC, AG, AJ, AP, AND AY BODY VEHICLES. THE BLACK MARK IS FOR ALL OTHER VEHICLES.
Start the engine and let idle. Set the blower motor to HIGH.
Put on goggles and dust mask type breathing protection.
Spray the entire contents of the evaporator cleaner into the evaporator cavity.
NOTE: A "FOG" MAY BE SEEN ENTERING THE PASSENGER COMPARTMENT WHILE THE EVAPORATOR CLEANER IS BEING SPRAYED. THE EVAPORATOR CLEANER WILL NOT STAIN OR HARM THE VEHICLE INTERIOR, BUT GOGGLES AND BREATHING PROTECTION MUST BE WORN DURING CLEANER APPLICATION. DO NOT BREATH VAPORS!
When the can is empty, turn the ignition switch to the OFF position and let the vehicle sit for 20 minutes. This time will allow the cleaner to flow over and coat the evaporator fins and case assembly.
Install whatever components that were removed to gain access for application of the cleaner. On AS, ES and 1994-1998 AN, seal the access hole drilled in step 3 with black silicone sealer.
NOTE: OWNERS OF NS/GS VEHICLES THAT OPERATE IN CONDITIONS WHERE THE AIR INLETTO THE HVAC HOUSING ISSUBJECT TO FOREIGN MATERIAL, DEBRIS OR OTHER AIRBORNE CONTAMINATES, MAY WANT TO CONSIDER HAVING A MOPAR ACCESSORY CABIN AIR FILTER KIT INSTALLED, P/N 82202509. USE THE INSTRUCTIONS PACKAGED WITH THE KIT TO INSTALL IT.
Open all of the vehicle windows about 13mm (½ in.). Start the engine and let idle for a MINIMUM of 30 minutes with the temperature control to full hot, blower speed to HIGH, PANEL and RE-CIRCULATE modes selected. This will dry and cure the evaporator cleaner onto the evaporator coil.
Connect the wiring disconnected in step 2 to re-enable the A/C compressor clutch.
Verify proper A/C operation.