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  #1  
Old 12-06-2010, 11:19 AM
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Turbovsix Turbovsix is offline
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Default Sticky fan clutch - still need clarity on this.

Hi All -

I know this has been discussed before, but I wanted to do a sanity check here.

The colder it gets here in NJ, the longer my fan clutch on my 2010 Ram stays engaged on cold startup. This morning, the clutch didn't dis-engage for a few miles of driving as a matter of fact. When it was warmer out, the clutch rarely engaged at startup, if at all.

I've personally never owned a vehicle where the clutch was engaged like that at startup, regardless of temp. And in vehicles I've owned where there was an actual fan clutch rather than electric fans, the fan didn't engage fully unless the temp reached a certain level.

Why the lockup during a cold start? Is it to put extra load in the engine to make it warm up faster? I just don't understand. I read somewhere that it had to do with pollution but I'm not understanding that concept fully. Any guidance would be appreciated.

Thanks!
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Old 12-06-2010, 01:07 PM
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Default

It's not uncommon for the viscious fluid in the clutch to thicken when cold and lock the clutch after it has sat for some time. My 2006 Duramax did this as well. It's perfectly normal. As long as it releases after a few miles/minutes of driving, you have nothing to worry about.
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Old 12-06-2010, 01:12 PM
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Turbovsix Turbovsix is offline
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Default

Ok - I guess I'm not used to having a viscous/fluid based coupling for the clutch. My last few cars had electric fans, and the last vehicle I had that had a fan clutch used thermatic spring mechanisms to get them going.
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