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dieseldork77 05-27-2010, 01:10 PM I have a 2002 2500hd with the computer climate control unit. it randomly works when it feels like it. the heat and cold air work but it wont push any air. i have checked all the fuses but the all look fine. any help would be great!:rolleyes: thank you modified 05-31-2010, 03:05 PM Search "blower motor resistor". The electrical connector may be loose or have worn connections. The resistor module may be defective. One fuse supplies +12V for speeds Lo, 2, 3, and 4. A second fuse supplies +12V to relay on module for speed HI. heymccall 06-10-2010, 10:59 PM If the fan runs, but makes no airflow, change the cabin air filters. | ||