2001 2500HD CHEVYNovember 17, 2011MY 01 CHEVY 2500 HD Is makeing a howling noise even in park when you step on the gas just a little you can here it Keywords:2500 HDNoise 1 thought on “2001 2500HD CHEVY” admin November 17, 2011 at 3:21 am Remove the serpentine belts and run the engine again to check for the same noise. If it has gone, then you need to look at the pulleys and maybe even the belt/s themselves. Spin the pulleys by hand with the belts off and listen for something out of ordinary. If the noise is still around with the belt off, check your fluid levels and check for vacuum leaks or exhaust leaks. Comments are closed.