Here is my thread on trying to trouble shoot the Aux fans on my 1990 2.5Turbo. How do you buy new MB relays, do you need to order them through a dealer or can you find them through fast lane?

What I did with pics:

http://www.peachparts.com/shopforum/diesel-discussion/252895-car-runs-hot-under-load-1990-w124-300d-2-5turbo-post2250006.html?posted=1#post2250006

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1990 300D 2.5 Turbo 150k miles
1999 F250 7.3L Powerstroke 225k miles 22mpg
Intro Thread