AC smell

[TerryH]

I have recently noticed a fairly strong musty-wet towel smell from my AC when I first start up my SSR. Is there an ac filter that could be wet, or a condensation drain hole that is plugged?
Thanks

[Ricochet]

This is fairly Common on todays modern vehicles. I have found taking a can of Lysol disinfectant spay and turning the fan blower on low and spraying the Lysol in the vent outside just below the windshield helps a lot. What you are smelling are mold spores on the inner coil. Hope this helps some

[Double-L]

Helps to to turn your ac off and turn your blower all the way up and let it run for awhile after you are done with your drive

[wingrider]

Here is a bulletin for a/c odors. The bulliten only goes up to 2002 model years but my GM rep covers it under warranty even for vehicles newer than 02. you might want to ask your dealer. Document ID# 798948
2002 Chevrolet Monte Carlo


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Subject: Air Conditioning Odor (Install Kit) #99-01-39-004A - (05/22/2001)



Models: 1993-2002 Passenger Cars

1993-2002 Light & Medium Duty Trucks




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This bulletin is being revised to update the model years, service procedure, parts information and to add the GEO and Medium Duty models. Please discard Corporate Bulletin Number 99-01-39-004 (Section 01 - HVAC).


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Condition
Some customers may comment on odors emitted from the air conditioning system, primarily at start-up in hot humid climates.

Cause
This odor may be the result of microbial growth on the evaporator core. When the blower motor fan is turned on, the microbial growth may release an unpleasant, musty odor into the passenger compartment.

There are several other possible sources of a musty odor in a vehicle. A common source is a water leak. Follow the Service Manual procedure for identifying and correcting water leaks if other odor sources are found. The procedure contained in this bulletin is only applicable if the source of the odor has already been determined to be the HVAC module.

Correction
To remove odors of this type, it is necessary to eliminate the microbial growth and prevent its reoccurrence. To accomplish this, the following steps must be completed:

Apply evaporator core Cooling Coil Coating (Aerosol 6 oz), P/N 12377951 (AC Delco® 15-102) (in Canada, use P/N 10953503) or Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC Delco® 10-120).
Refills are available for the Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC Delco® 10-120). Refer to the chart below.

Install the Electronic Evaporator Dryer, P/N 12497910 (AC Delco® 15-5876).
Important: The Cooling Coil Coatings listed above are the only GM approved products for the disinfection and long-term control of evaporator microbial growth.

The Cooling Coil Coating will disinfect the evaporator core and help inhibit the growth of future mold and mildew.

The Electronic Evaporator Dryer will activate when the ambient temperature near the module is above 16° C (60° F) when the vehicle is started up. Approximately 30 minutes after the vehicle has been turned off, the blower will activate for 10 seconds every 10 minutes for 2 hours unless the vehicle is restarted. If a restart occurs, the Electronic Evaporator Dryer module will reset automatically. This on/off blower activation will dry the evaporator core and case reducing the chance of reoccurring A/C odor. The Electronic Evaporator Dryer is self fused and has a battery rundown protection feature that inactivates the dryer if voltage drops below 12.5 volts.

Service Procedure
Visually inspect the air conditioning evaporator drain hose for obstructions and/or working condition.
The cooling coil coating fluid must be applied to a dry evaporator core. Apply coil coating fluid as described in the instructions supplied with the kit. In some instances, the blower motor resistor can be removed for this spraying operation. If used, the opening can be taped over and the nozzle inserted through a hole in the tape. The kit instructions identify a drilling procedure to apply the coating fluid. When using this type of procedure, care must be taken to avoid evaporator damage and any holes must be properly sealed. Some coating fluid may overflow from the drain hose.
Important: When installing the Electronic Evaporator Module, you MUST use the included electrical splice connectors to ensure a proper splice.

Complete detailed installation instructions and wire connectors are supplied with the Electronic Evaporator Dryer. The ground wire should be attached to a body ground source. If any other wire splicing procedures are needed, follow the wire repair procedures in the Electrical sub-section of Body & Accessories in the appropriate Service Manual. If required, the evaporator dryer can be installed underhood away from extreme heat conditions (i.e. exhaust manifolds) and/or water splash areas. In all cases, the evaporator dryer module must be secured with a Velcro® strip (not included in the kit), or you may use the integral hooks to utilize tie straps. Using a Velcro® strip is preferred as the use of the integral hooks may cause rattles.
When the installation procedure is complete and power is supplied, the module will self-test. Thirty seconds after power is supplied, the high blower speed will be activated 3 times (for 2 seconds per cycle). When the test has run, install the Electronic Evaporator Dryer label on the blower motor case in a visible area.
Parts Information
Part Number
Description

12377951

(AC Delco® 15-102)
Cooling Coil Coating (Aerosol 6 oz)

12346391

(AC Delco® 10-120)
Cooling Coil Coating Kit w/Extention Nozzle

12346390

(AC Delco® 10-121)
Refill for Cooling Coil Coating Kit

12497910

(AC Delco® 15-5876)
Electronic Evaporator Dryer Module Kit


Parts are expected to be available from GMSPO, 6/4/01.

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation
Description
Labor Time

D3316
Apply Cooling Coil Coating/Install Electronic Evaporator Dryer
0.8 hr




GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 798948
2002 Chevrolet Monte Carlo

[TerryH]

Great info.
Thanks eveyone.

[SMKN04SSR]

GM Tech. assist. has also told me in the past to recommend to my customers when first started, run ac on outside air for 10-15 minutes to get some fresh air thru ac/heater ducts. Will help dry out any moisture inside and also will cool down
cab faster. After that then you can change to recirc. mode if you choose. I have installed that fan kit into some later model trucks than the bullitin above calls
for and have had no issues from doing so as well.

Have fun

[Ricochet]

WoW thats quite an extensive fix. Why not just install this system at the plant on every car and Truck thats my question. In the long run it would save on warranty costs I would think.