Blower fan will not turn off

nss79 · November 21, 2006

GM TECH,

I have a 2006 Chevrolet HHR. I found this site while searching for info on the afterblow feature and figured you might be able to help. First time to dealer, the blower would randomly come on or would not turn off, it would stay on the second highest speed (I can adjust between the 2 highest speeds but nothing else). They said that the car had a burned resistor. After I picked the car up I noticed that it was still doing it, it does not come on by itself anymore but when I turn it on I can't turn it off. I took it back to the dealer and guess they couldn't find anything, they said they contacted GM tech and attributed the problem to the afterblow feature. I picked the car back up and I kept thinking that there had to be more to it. Did some searching on the afterblow it sounds nothing like my problem, it does NOT run when the car is off, I am NOT running the AC, and it is NOT above 60 or 70 degrees right now. Any ideas on this, should I go back to the dealer and have them investigate further? I would appreciate any help you can give. Thanks

GM-Tech · November 22, 2006

I'm not 100% sure, but I think once afterblow is turned on, it cannot be turned off... short of replacing the a/c control head. The TSB that describes enabling this feature comments on how the customer needs to approve enabling this feature so that says to me that once it's on, it's permanent.

GM-Tech · November 21, 2006

Sorry, I have no advice on this one. This is not a problem I ever heard of on an HHR.

Some general comments...

Did they enable the afterblow feature on your vehicle? This is NOT enabled by default from the factory. It has to be enabled by programming at the dealer for an a/c odor problem. If you never complained of anything like that, then it's unlikely it's enabled.

Even if it is enabled, it works like you described and I don't see how it would lock the blower into one of two speeds (afterblow activates high speed only) and then when the vehicle is on.

While we do have our fair share of blower resistor problems across all our models, these cause the blower to quit working altogether at certain speeds, not stay on.

If I had to guess, and that's all I can do at this point, it's probably a problem in the a/c control head.

This is a rather oddball problem and I would take it back to the dealer and demonstrate the problem to them if necessary.

LonerWolf · November 23, 2006

My 2000 2500 does this occassionally. Sometimes the fan will go to high for a moment. Sometimes I can't turn it off. Seems to be no pattern to the problem. Seems to be posessed.

nss79 · November 21, 2006

I was told by the service dept that the feature was most likely turned on when the original work was done. Now that I have found out some more about how the afterblow feature works I will definitely stop by the dealer again and talk to them and maybe see if they can deactivate it and see if the problem continues. Thanks for your help on this.