Quote:
Originally Posted by Skippy
How I test fan clutches in cars: Cold, engine stopped-fan should be able to spin freely by hand. Next, run the car enough to where the fan should definitely be on. Stop motor and immediately check to see how hard it is to spin the fan. If it's kind of hard to move, then you're good. If it spins freely like it did in the cold test, it's time for a new fan clutch.
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The opposite is also true. If the clutch is always engaged, even when cold, it's bad.
And check that ALL fan blades are intact, with no cracks. I had to replace both in my 300D W123 due to a seized clutch (always "engaged") and a few cracks in one of the blades.
I think the 602/603 engine has a slighty different setup, the clutch may have only one center bolt. Make sure it's intact, and the bearings inside are not noisy or allowing the fan to wobble.