Check the location of various relays on the 1985 300D

turbo

[url]http://www.************************

Then look for your car and model, then look under elecrical, look for relays, look for temperature switch,this will give you a picture of all relay location. Look for 5 in the picture. thats the aux fan relay.
Hope this works
MVK

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1985 300D Turbo 179,000miles