Is there a TSB for an oder comming from the ventalation system? I have had a nasty smell being emited from the vents in my truck for the past week. At first I thought it was in my seats and then the rug, but after a good clean and shampoo I found it was comming from the vents. I did just change the cabin filters too.

Thanks for any help
Jay

Could be a dead field mouse.

That thought did occur to me.

<H1 align=left>
<CENTER>Air Conditioning Odor (Install Kit) #99-01-39-004A - (05/22/2001)</CENTER></H1>
<DIV align=left></TABLE>Air Conditioning Odor (Install Kit) </DIV>
<DIV align=left>1993-2002 Passenger Cars</DIV>
<DIV align=left>1993-2002 Light &amp; Medium Duty Trucks</DIV>
<DIV align=left>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).</DIV><A name=ss1-798948><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=798948&amp;pubid=210#ss1-798948" target="_blank">
<DIV align=left>
<H5>Condition</A></H5></DIV>
<DIV align=left>Some customers may comment on odors emitted from the air conditioning system, primarily at start-up in hot humid climates.</DIV><A name=ss2-798948><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=798948&amp;pubid=210#ss2-798948" target="_blank">
<DIV align=left>
<H5>Cause</A></H5></DIV>
<DIV align=left>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.</DIV>
<DIV align=left>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.</DIV><A name=ss3-798948><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=798948&amp;pubid=210#ss3-798948" target="_blank">
<DIV align=left>
<H5>Correction</A></H5></DIV>
<DIV align=left>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:</DIV>
<DIV align=left>

<LI ="1">Apply evaporator core Cooling Coil Coating (Aerosol 6 oz), P/N 12377951 (AC DelcoŽ 15-102) (in Canada, use P/N 10953503) or Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC DelcoŽ 10-120). Refills are available for the Cooling Coil Coating Kit with Extension Nozzle, P/N 12346391 (AC DelcoŽ 10-120). Refer to the chart below.
<LI ="1">Install the Electronic Evaporator Dryer, P/N 12497910 (AC DelcoŽ 15-5876). </LI></DIV>

<H4 align=left>Important</H4>
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.<A name=ss4-798948><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=798948&amp;pubid=210#ss4-798948" target="_blank">
<H5 align=left>Service Procedure</A></H5>
[list=1]
<LI ="1">
<DIV align=left>Visually inspect the air conditioning evaporator drain hose for obstructions and/or working condition. </DIV>
<LI ="1">
<DIV align=left>The cooling coil coating fluid must be applied to a dry evaporator core. Apply coil coating fl

Thanks for the info GMCSID. I'm not sure this is my problem [:Cry:.] I guess that could be a good thing http://www.dieselplace.com/forum/smileys/Approve.gif. The weather around here had been in the mid to low 30's so I have had the heat on. At first I thought the oder was just body funk from a fire I was at the night the oder started. I cleaned the rugs and seats then gave it a good febreezing but the oder was still there. My next venture was to pull the filters out again and make sure I got all the junk out of the vents. I still have the oder http://www.dieselplace.com/forum/smileys/Cry.gif Now I'm pulling the center console and tape deck to clean under there. I'm still not convinced that I have found the source yet though.