85K miles. Noise is coming from the front of the vehicle. I guess I should probably just bring it in to the mechanic. I need to have the AC checked to see why that is not working.Could be many things. How many miles on the vehicle? If you stop accelerating in the middle of getting up to speed, does the noise stop? We need to separate out engine-related causes from driveline causes. Engine issues are in the serpentine belt, idler pulley, and fan shroud/fan/water pump areas. Driveline issues might be in the hub bearings, CV shafts, transfer case, driveshaft, or rear differential. Any chance somebody can drive next to you as you speed up and see if the noise is from the front or rear?