I brought my 2000 S40 (37000 miles) in for a recall notice and mentioned to the dealer that I heard a "thunk" sound in the front right section of the car. He said that the motor mounts needed to be replaced. I looked them over (the upper mount on the passenger side and the two L/R mounts under the engine on the drivers side) and they look fine. There are no cracks or obvious impact/rubbing points. So my question is: How does one tell when they are bad? I've searched the archives for engine mount related issues, and it seems they are fairly easy to replace, but before I go ahead and begin replacing them, I want to be sure that they are faulty.
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