Question about 2005 Chevrolet Tahoe 4WD
Have a noise that comes after a stop. when vehicle takes off a short noise that sounds like a pump running then quits after a few seconds
Check if you have a viscous fan hub. If you have it will be that the hub has started working while you were stationary to raise up the fan speed to assist in cooling and when you rev up to take off the increase rpm increases the fan noise and when the air is passing through the radiator the hub cuts out and the fan noise goes.
Posted on Nov 23, 2013
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When checking to make sure noise is wheel bearings while driving vehicle at speed the noise is loudest (if possible) turn steering wheel back and forth enough to shift the weight of the vehicle from side to side and if it's a wheel bearing there should be quite a bit of difference in the noise.
If about the same noise check the wear pattern on the tires for flat spots or unusual wear pattern if there is rotate tires. If nothing still found jack up vehicle with all 4 tires of the ground. Use jack stands for this. Get some one in vehicle to run it at speed the noise develops, I use a long screw driver (2 feet long) as a stethoscope to find where noises come from. Try with and without 4 wheel drive if possible. Good luck cause noises can be a real pain in the b____.
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