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Originally Posted by JackandJanet
 I thought you said the change was in the 2008 MY. |
2006 or 2007, AFAIK. PCM-controlled fans have a harness with connector a 5 wires that sit between the water pump pulley and the fan hub.
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My 2005 certainly has viscous drag when I attempt to spin it by hand with the engine stopped. I haven't actually tried this, but as I understand it, the drag should be greater if the engine is hot.
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If harder to turn when hot and no wiring, then that sound like your 2005 has thermo controlled clutch.
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I doubt you could measure it with a fish scale though on a stopped engine. You'd need to catch the fan to a scale mounted on a rafter or something and measure the force on the stalled fan with the engine running. Then, you could calculate the torque/hp loss from this force and the distance you had the "hook" from the hub. It's not something I'd like to try, since it sounds a bit dangerous.
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Right, not a good idea to do it that way.
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2007 F150 XL, 4.6, Regular Cab, Gryphon Installed 2/2009
"voiding warranties since 1979"
