My wife's CRD 06 started making an intermittent clicking, tapping sound (like a stone in a wheel)coming from right rear tire area. Sound speeds up, slows down with pace of vehicle comes and goes mostly when cold. Lasts for a 30 sec. Placing vehicle in neutral (automatic), speeding up engine, or braking does not make sound go away, putting it in 4 wheel mode does not affect it. Any ideas??
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