Help me solve this problem

Luv-N-It said:
Everybody has good suggestions for remedies. What causes it? Don't turn your car off with the A/C running. Before turning your air conditioner off, or before you get to your destination, turn your A/C off and run the vent selection on HI for 1-2 minutes to help eliminate the condensation/moisture build-up within your vents. This was suggested to me when I asked a GM tech this very question about my parent's car.

Ever since then, I always put that suggestion into practice. Drive my wife nuts, but I also tell her why and the effect it can have on the vehicle and the air we breathe. She then quiets down. You can tell when the condenstaion/moisture has stopped coming out and its just fresh air.
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Other possibilities too are the drain at the bottom of the air intake chamber gets plugged and water remains there. Apparently the problem is more prevelant in humid climates. Here is the GM Bulletin on that subject.
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Odor Correction
Eliminating Air Conditioning Odor
Odors may be emitted from the air conditioning system primarily at start up in hot, humid climates. The following conditions may cause the odor:

Debris is present in the HVAC module.
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. To remove odors of this type, the microbial growth must be eliminated. Perform the following procedure:

Deodorize the evaporator core using Deodorizing Aerosol Kit.

Perform the following steps in order to deodorize the A/C system:

Ensure that the plenum which draws outside air into the HVAC module is clear of debris.
Disable the A/C compressor clutch operation by disconnecting the clutch coil electrical connector.
Dry the evaporator core by performing the following steps:
Start the engine.
Select the warmest temperature setting.
Select the recirculation mode.
Run the blower motor on high for 10 minutes.
Locate an area in the air conditioning duct between the blower motor and the evaporator core downstream of the blower motor.
Drill a 3.175 mm (0.125 in) hole where the hole will not interfere with or damage the following components:
The blower motor
The evaporator core
Any other operating part the of system
Wear safety goggles and latex gloves in order to perform the following actions:
Select the maximum blower speed.
Insert the deodorizer extension tube into the hole to the mark on the extension tube.
Use short spray bursts and vary the direction of spray for a 2-3 minute period of time.
Shut the engine OFF. Allow the vehicle to sit for 3-5 minutes.
Seal the 3.175 mm (0.125 in) hole with body sealer or RTV gasket compound.
Start the engine.
Operate the blower motor on high for 15-20 minutes to dry.
Reconnect the A/C compressor clutch coil electrical connector.
Verify proper clutch operation.
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sgo said:
When we first get into the car and the heating/air conditioning blower starts blowing, the air has a rather annoying smell. I don’t know if you would call it musty or something else, but it is really bad. After a few minutes it either goes away or we get used to it. I’m not sure.
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My car has the exact same problem, we took it to a couple places and found that it was some sort of mold or bacteria. I was going to have it cleaned but was told it is pretty much impossible to completely get rid of the smell. The smell for my car only lasts a few seconds though.
 
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