I just bought a 2001 F150 with a 4.6 and have noticed a fan noise. I mean when the truck is off the heater and the fan etc. are off and I put the ignition to acc. There is a fan that comes on and this fan is also running when the truck is on. I am guessing it's a fan for the computer? I'm not worried about it I'm just wondering what it is. Does anyone know what this is?

 

i kinda have the same thing i haer a light wining nosie for a fe seconds after i shut the truck off after drinving it

 

it's probably your fuel pump...

 

Fuel pump doesn't run in ACC. The heater fan runs in ALL positions of the selector switch (max, AC, panel, etc.) except OFF.

 

my noise is up front kind like its in the dash maybe iunno

 

There is a fan cooling the radio, it's normal.

 

Thanks Bluegrass, that clears up any issues.

 

i have an aftermarket radio tho, does it still have the fan?

sorry for threadjacking lol