smokeywren

My '99.5 F-250 diesel had a fan clutch that would lock on when the air coming through the radiator indicated the coolant was getting too hot. When the fan locked on at highway speeds, the roar coming from that fan sounded like a 747 landing on your hood, the fan would draw a hurricane worth or air through the radiator, and the coolant temp would begin to drop immediately. The first time it happened, I thought I had broken something expensive in my drivetrain.


But I suspect my F-150 EcoBoost doesn't have that sort of fan clutch. It's two viscous fans, but does it have a way to actually lock the fan(s) on to draw a hurricane worth of air through the radiator the way my diesel did? I've never heard that 747 sound from my F-150, and I've towed severely overloaded through the Texas Hill country a couple of times.
http://parts.autonationfordwhitebear...oling-fan-scat

Feathermerchant

smokey - You have two electric fans behind your radiator. They only run when needed. On my 2011, they are 12V fans and wired so that they can run in series (run on 6V each) or in parallel where they are on 12V. So low speed and high speed. The good thing is that they can run at 'hi' speed even when your truck is sitting still and the engine is idling.

Suzuki14258

X2

Op truck will have a old school fan clutch though and if its not working he will have issues no matter what he does. Sometimes on my 13 ecoboost at idle the fans kick on to where it sounds like your walking by a jet airplane.

Feathermerchant

True. I had a 77 Scirocco that just had a switch on the radiator. Fan would run anytime the radiator was hot enough. Even when the car was off.