Corvette Z06 Forum banner
1 - 6 of 6 Posts

·
Registered
Joined
·
612 Posts
Discussion Starter · #1 ·
I've noticed lately that when I don't use the A/C, I'm getting a mildew smell coming from my vents. It takes a few days for it to go away. Also, I had the A/C on yesterday and went to a friends house. The car was parked for about 2 1/2 hours. When I left to go home, I still had a wet spot on the ground about 12" in diameter. Does this seem strange to you guys? In 2 1/2 hours time, shouldn't the condensation be dried up? This tells me that it was still dripping out well after I shut the car off.
Has any one experianced the same kind of problem? Could I have a clogged condensation line? I know that my wifes Cherokee had a clogged line and it was backing up into the car!
Any thoughts? :bang:
 

·
Registered
Joined
·
18,357 Posts
Local parts stores sell a spray that helps remove the mold and mildew from the vents. Being in the insurance business, I've come to realize how bad inhaling airborne particles can be to you. I don't do this but I've been told that you should use the outside air on your AC for a few minutes before you turn your car off. My Z used to get that smell every time I turned it on in the morning but it cleared right away.
 

·
Registered
Joined
·
1,533 Posts
HDRAMROD said:
I've noticed lately that when I don't use the A/C, I'm getting a mildew smell coming from my vents. It takes a few days for it to go away. Also, I had the A/C on yesterday and went to a friends house. The car was parked for about 2 1/2 hours. When I left to go home, I still had a wet spot on the ground about 12" in diameter. Does this seem strange to you guys? In 2 1/2 hours time, shouldn't the condensation be dried up? This tells me that it was still dripping out well after I shut the car off.
Has any one experianced the same kind of problem? Could I have a clogged condensation line? I know that my wifes Cherokee had a clogged line and it was backing up into the car!
Any thoughts? :bang:
This is a common problem, a few local C5 owners here have had the drain hole get plugged... they get mildue and leaks... the leaks can cause lots of damage... get it cleaned (ream the drain hole!).

It should be a cheap fix and you should not need new parts. You probably just glued to much pollen over the summer to the condensate inside the core.

Zed
 

·
Registered
Joined
·
1,750 Posts
I have that problem, too. The dealer has a cleaning procedure that I had done, but it didn't help for very long. I've seen a service bulletin where they install a switch that allows the fan to run for a while after shut down, to allow the moisture to dry out. I haven't had that done (yet). I've been spraying Ozium into the vent, with the AC on recycle, to try and kill off some of the smell, but it doesn't last for long.

I also have a lot of condensation from under my car--http://zo6vette.com/forums/showthread.php?t=61769

Zed, do you know where the "drain hole" is? I know there is a drain tube behind the battery--I've checked it and it is clear...
 

·
Registered
Joined
·
1,640 Posts
The smell (I call it the "dirty socks smell") is a common problem with these cars when you run the A/C mostly with Inside Air Re-circulation.

I let the A/C run with outside air for the last minute or two before I get to my destination. Guess what - haven't had the "dirty socks smell" since.

Try it - you'll like it!
 

·
Registered
Joined
·
17,744 Posts
99-01-39-004A
A/C - Odor Emission in Hot Weather
May, 2001


Subject: Air Conditioning Odor (Install Kit)

Models: 1993-2002 Passenger Cars, 1993-2002 Light & Medium Duty Trucks


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).


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(R) 15-102) (in Canada, use P/N 10953503) or Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC Delco(R) 10-120). Refills are available for the Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC Delco(R) 10-120). Refer to the chart below.
# Install the Electronic Evaporator Dryer, P/N 12497910 (AC Delco(R) 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 Electric Evaporator Module, you MUST use the included electrical splice connectors to ensure a 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. I f 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(R) strip (not included in the kit), or you may use the integral hooks to utilize tie straps. Using a Velcro(R) 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

Parts are currently available from GMSPO.
Part Number Description
12377951
(AC Delco 15-102) Cooling Coil Coating
(Aersol 6 oz)
12346391
(AC Delco 15-120) Cooling Coil Coating Kit w/Extension Nozzle
12346390
(AC Delco 15-121) Refill for Cooling Coil Coating Kit
12497910
(AC Delco 15-5876) Electronic Evaporator Dryer Module Kit


Warranty Information

Labor Operation Description Labor Time
D3316 Apply Cooling Coil Coating/Install Electronic Evaporator Dryer 0.8 hr
For vehicles repaired under warranty, use the table as shown.
 
1 - 6 of 6 Posts
Top