I know my car has a "option/ recall etc" where the AC fan comes on every few min for 30 seconds for like 2 hours while the car is off to dry out the AC vents. This was some recall or update the DLR did. I have the paperwork for it.

My question is this...

I have not drive the car in like 1.5 weeks and I came out this morning to the fan running for the 30 seconds. I have not even had the key in the ignition for 1.5 weeks. I did put the lights on last night to try and change the bulbs but that's it.

Why would this be doing this function when the documentation says it should only do it for 2hrs after the car is shut off?

How can I check it?
I have the car on battery tender so I'm not worried about the battery going dead but want to know why this is happening. I never noticed it before today (had the car for 3.5 yrs now. It may have been doing it but sitting inside covered up I would not notice Just this morning I heard it on my way out.

 

no one else has had this issue? I googled a few things but nothing specific

 

Honestly I have never heard of this issue before. My AC fan doesn't come on after I shut the car off, at least not that I'm aware of.

 

It was a dealer (or owner) installed option, called a "Delayed Blower Control Module", that became available several years into the C5 production when owners began complaining about musty odor, etc emanating from the HVAC housing, typically after using the A/C. Moisture and/or debris would collect inside, mold and/or mildew would then grow, and the module would keep the fan on after shutdown to dry the inside of the housing to kill or retard mold/mildew growth. There was a TSB issued by GM covering this and the "kit" has installation instructions, etc. Do a search.

There was also a procedure in the shop manual for spraying an anti-fungal "deodorizer" material inside the housing to assist in this effort and to retard future fungal/mold growth. The GM part # for the spray deodorizer is: 12370470

Maybe your module is malfunctioning. I think it's on a straight timer and the device activates the fan after any prior use of the AC. At least I'm pretty sure that's how it's triggered. As far as I know it does not have a temp sensor or moisture detector that would kick the fan on after an extended shutdown period, but I may be wrong on that part.

HTH

 

Thank you for the info. All I could find for paperwork was that it was installed. I dont know where or how to uninstall it.

I noticed again this morning (mind you have not touched the car for several days) that the fan was blowing as i walked by and shut off.

May be its jealous I am driving the truck so much and it wants to go out and play

I just want to be sure its not s short that will kill my battery and cause a fire or something like that.

I am not having good luck searching. 2 site i tired gave me 404 pages.

If you know the TSB or have a goo TSB link let me know. Thanx I appreciate it.

 

I called my dlr and they said it could be a program $130~ or a new module is needed $500~
This is not user serviceable on the 2000 vette. This is part of the HVAC system and its not a simple plug and play module like I had hoped for.

If anyone has any experience with how to resolve this let me know. I dont want to do the dlr thing and dont want to waste a bunch of $$ on it.

Thanx

may be ill pull the battery and let it sit for a few. Some times that resets stuff...

 

Amazing. I'd never even heard of this "option" until this thread. I'm pretty certain that my 2002 is not equipped with it.

 

i've never experienced that "option". mine is an 04 CE convertible

 

It was not an RPO option. The AC Delco division made the unit available for GM and put together the "kit" for dealers to be able to install if a customer was complaining. It was not Corvette specific.

The AC Delco part number is 15-5876 and at least three are currently being sold on Amazon. Price in the $284 - $296 range.

 

Well its off to the dlr I guess. I left the battery off all night. But as soon as I connected it the fan went off. I did not have time to check any more before work. But I may reconnect and wait a day or so and see if it happens at different times.

It has some force for sure. My softop bows up when it kicks in. That cannot be good foe the top.

 

Well i have not noticed the fan running the last few mornings after I connected the battery.

On thing I did do was to turn the ignition on but not start the car and press the off on the HVAC controls so may be that has something to do with it?

 

This might be reaching but, have you run the codes and cleared all the HVAC codes and see if it resets? Just a thought......

 

I looked and there are no codes on the car. Thanx for the idea

 

Have not heard of this.

 

well after pulling the battery and making sure i hit the off button on the HVAC system before getting out of the car i have not noticed it happening again.