Momentum,
the steering dampner is located under the car. It is an elongated shock attached to the drag link. Between both front wheels. One way to test it is, remove one end and push that end in. If there is no resistance, you need a new one. Good news is, they are around $30. All you have to do is remove two bolts, remove old dampner, put a new one in. You are done.
Good luck!

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J.H.
'86 300E