2003 Buick Century

[Fletcher]

Can anyone tell me where the A/C condensate drain is locate on my Century? I think that it is plugged up! The car has a Very bad Musty smell when I have the air coming out on vent setting, it doesn't seem to smell when the A/C is on however! Any Help on this subject would be Greatly appreciated.

[DanD]

The catch pan drain tube is on the firewall, more toward the passenger side of center about half way down the engine compartment. It would be easier to get at from underneath, there will be a short elbow attached to it facing down. If it is plugged you may need to use an air blower to clear it.
You may also want to check the cabin air filter, if it has become wet there maybe some mold growing on it causing a smell. You get at it from under the hood and removing a couple of panels, most of the after market filter suppliers like Fram come with replacement instructions. Here’s a diagram showing its location just below the windsheild on the passenger side..

GM has had a problem with this smell and their fix is to deodorize the evaporator. Here is a description of the fix, explained better then I could do.
You can buy the aerosol deodorizer kit from the dealer.
Good luck with your stinky car. LOL
Dan.

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 mirocbial 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 that 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 maximum 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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[rainandsun]

i agree that sometimes this problem occurs when there's a problem in cabin air filter. try first to use another cabin air filter. here's a steps on how to replace a cabin air filter.