I am having a hard time. I have a 2005 silverado 1500 4x4 with auto climate control and rear defrost. my problem is the fan is running always. even when ...

I am having a hard time. I have a 2005 silverado 1500 4x4 with auto climate control and rear defrost. my problem is the fan is running always. even when the key is out of the ignition. so i pulled the fuse so that it doesnt kill my battery overnight. after watching some videos i assumed it was the resistor. so i changed that with a new one from the parts store. the fan was still stuck on. so i changed out the climate module thinking that was the only other possibility. well the fan is still always blowing. and i am 350$ in the hole. can anyone help me please.