Need help, fan noise while hauling.
So this weekend hauling 5,000lbs and going over the mountains only doing about 40mph. due to traffic. Mid through when I hit the gas ever so slightly a "fan" sounding noise occurred during acceleration. All of my parameters have been set pretty low. I have a 175 tune with dpf delete. Any help on what this noise could be would be great. Spartan tuner, Cat back MBRP, SD intake. That's it. Just want a reliable truck. Also did not loose boost, or power, and everything responded nicely. First time hauling something that heavy with the tuner so not sure what to expect. Thanks again guys