My 2005 Magnum is having an issue with the heater that I have not been able to find any info on. The fan dial for the heater is turned off, yet the blower keeps blowing the air out at high speed. No matter what setting I have it on, the blowing air never changes speed. There is no problem with it being hot or cold, just can't turn it off unless I pull the fuse. Any ideas would be great, thanks!

 

Sounds like your module has gone internally.