Just wanted to post the tool which I have been using to lock the fan clutch:
Not sure what the item actually is...but it works!



All I did was bend the tip as shown and it works 100% perfect

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k