I believe it is a 35 or 36mm bolt that is behind the clutch / fan. It bolts the fan / clutch to the waterpump. You need to remove it and the fan and clutch will come off.
NOTE: There is a special tool that is used. However I have never had any luck with them. I use a large crescent wrench with a dead blow hammer to loosten it. After about the 3rd or 4th his, the bolt usually comes loose. If you have other questions, let me know.
Joe
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Tuesday, June 16th, 2009 AT 4:11 PM