Does anybody have an idea about why I'm hearing my radiator fan now almost all the time? Upon further investigation today, I popped the hood and listened to it at idle. It appears to not know whether to run or not. It starts to really turn, then backs off a bit, then goes faster, then slower. It's cold here (about 35) so I know the engine doesn't need the extra cooling. Is there a sensor for this fan that could have been messed up when they did the body lift? That's when I started noticing it (immediately). It's going back to the shop, but I'd like to know what I'm talking about when I go. Anybody?

 

Is this a stock fan, or electric fans ( and which mfgr the kit is, if electric ) ?

 

Sorry. The fan is the stock fan. The truck is a 2001 Supercrew with the 5.4, automatic.

 

OK, not knowing if the stock engine came with an electric or direct drive fan, I'll take a leap of faith and say that the fan is a direct drive off of the engine belt. If it's slipping, something probbaly has gone wrong with the Fan Clutch and it will need replacing.

TonyPTX