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In the 1961 Disney classic "The Absent-Minded Professor," actor Fred MacMurray played a professor who developed a black gooey substance dubbed Flubber, enabling his Ford Model T to challenge the laws of gravity and fly. Ford Motor Company scientists now are experimenting with a different black gooey substance that also seems to transcend the normal laws of physics. This new material has the unique ability to change viscosity on command. While Ford's gooey substance or magnetorhelogical material (MR material), the official lab name, won't enable cars to fly, it can behave as a free-flowing liquid, a paste-like solid, or anything in between, switching properties in the blink on an eye when a magnetic field is applied. Ford is experimenting with the use of MR material in air-conditioning compressors as a way to subdue the audible clicking that occurs when the clutch engages and disengages. The MR material allows the clutch to gradually engage, providing a smoother, less noisy contact or "soft start." When the clutch disengages, the material reverts from the solid "locked-up" state to a fluid to let the clutch slip out of contact. This soft engaging and disengaging of the clutch also makes power surges from the engine less noticeable, a condition typically felt in vehicles equipped with small displacement engines.
So like Mr Brown says above, it's probably a normal sound of the clutch engaging or disengaging.
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