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Message: <blockquote data-quote="dvdswan" data-source="post: 1053395" data-attributes="member: 78504">1)  Yes, at 300k a fan clutch can be faulty.To test, with the engine cold, spin the fan.  There should be some resistance but it will turn and spin 1 to 3 times around.  If it spins freely or does not spin at all you have a bad fan clutch.  If it is locked up, it's not all bad you will still have cooling just the typical loud roar of the fan when the clutch is engaged.  On cold morning you should hear this for about 30 seconds to a minute before the clutch gets to ambient temp or even operating temp.2)  Several thoughts on this.  How are your body mounts, specifically, the front 4 (2 on the rad support to frame and 2 on the front of the cab) could be bad/worn out or rusted.  Radiator supports (the seats where the radiator sits) could be bad/worn out or rusted.  I would also check your engine mounts.  Yes, normally when these are bad the lower shroud would be chewed up.  But on the chance that both are bad and the engine had shifted position this would happen as well.3)  My T-stat housing came with a new t-stat, gasket, and seal.  You just need to read the fine print explaining what you are buying.</blockquote>