That is the bi-metallic strip that goes on the front of the fan clutch. It is responsible for engaging the fan when it heats up. Since that is off you may have also lost some silicone in the fan clutch as well. So you may also want to check on that. There is a small metal piece that resembles a piece if pencil lead that fits into a hole on the fan clutch and protrudes out and that bi-metallic strip fits over it.
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1990 190E 3.0L
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