seems to me all 2010s have electric fans? I did a PDI on a Platinum yesterday and it had electric fans, i figured cool must be a Platinum only thing...then today did a PDI on a Base XL and it also had electric fans! Tech next to me had an 09 in his bay so I looked and it only had a regular fan clutch setup not sure if this has been discussed before anyone else notice this?

 

If memory serves me correctly, the 2 valve 4.6 still has the old clutched fan setup and all of the 3 valve motors have the e-fans. Anyone else?

 

that could very well be...the 09 i looked at was up in the air and i didnt even notice which engine was in it. One 2010 was a 5.4 and the other was a 4.6 3v

 

Yes, they switched over to E-fans for '10. That's why the '09 you saw had a clutch fan.

 

All the 2009's have the clutched fan... they changed to electric in the 2010 models.

 

hmm good to know. Its rare i get to work on nice new vehicles I just happend to notice this today.

 

So 2010 put more power to the ground. That's nice to know.

Aftermarket kit claim 10 to 15 wheel hp with electric fan.

 

So what is a PDI?

 

Pre Delivery Inspection. Basically you check all the fluids, set tire pressures, put the antenna on/hubcaps, set the clock, check all lights, check seatbelts, testdrive ect...

 

I have an 09 with the 4.6 3v and it has an electric fan

 

Wow, I wish dealerships around here would take the time to "prep" a vehicle.

 

You have pics of this? My 09 4.6 3V does not have Efans.

 

The '09 fans do have an eletrical connection on them for the pcm to control the clutch.

The 2010's have an electric motor and aren't physically connected to the engine.

 

Wouldn't believe a word of that. How ever you look at it the power has to come from the engine either way. Either via the alternator which puts more strain on the engine or via the mechanical system that puts more strain on engine. I found a site a month or so ago that tested both systems because of this extra power debate and they couldn't find any advantage of electric over mechanical for HP gains. They also mention that using a engine to turn an alternator that in turn turns a motor does infact use more power than directly driving the fan straight from the engine because of the loss through the alternator and motor. But they did say it's a cheaper way of producing the fan untis.

 

They also said that they moved a lot less air than mechanical fans and didnt last as long.

I guess the way they figure it is if you have a mechanical fan moving air at 5000rpm and it's pulling 10hp a electrical fan which is also moving 5000cfm needs the same amount of HP to get that amount of CFM. Like they say. You cant get something from nothing. The engine will have to put out at least 10hp to give the electric fan enough power to move 5000CFM. If they could then all cars would be using gas engines to drive a electric motor that drives the wheels. They already do this but at massive decrease in HP/TQ. Same as the electric fan nearly always needs to run after you switch of the engine because they cant cool like mechanical fans.

But perhaps the laws of physics don't apply to engine fans