You have an 02 PCM also...I wonder if the 02 operating system is needed for them to work properly, since BigKid had problems also (didn't read his whole thread but I remember that he had issues getting his fans to turn off or something)

 

Cliffnotes.... Fans work fine on my truck with 02 PCM, however, they do not work properly on my 01 Tahoe using same settings on both.

 

I didn't think about that, I do have an 02 pcm.

 

That's interesting, I was under the impression that the 01 and 02 PCM's were the same...maybe there's a difference between truck and SUV?