Right, Its the 90 300d. Its the temp switch for the aux fan (on top of the engine where the upper radiator hose connects) to turn on when the car gets up to 105. A quick look at fastlane shows a 3 prong switch. Mine only has 2. I suppose they could have the wrong pic up.

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VegStew
1983 300SD 70,000 WVO Powered miles
1990 300D In driveway with Head Off - Cracked