Dorman 594-321 Serpentine Harmonic Balancer Direct replacement to ensure proper fit Ships with protective sleeve over cone and trigger to prevent damage (where applicable) Ease of installation with Dormans Harmonic Balancer Puller (594-999) Dampens engine vibrations Powers the alternator, power steering pump and a/c compressor Signals the cpk sensor for input to the cpu for engine operation Use harmonic balancer puller for proper installation Limited lifetime warranty