| On the next morning, turn the key to position #2 and see if the noise is heard. If the noise is present make sure that the blower motor on the A/C-Heater control is turned off. If it is and the noise is till present then it is probably the small fan in the e-box (engine fuse/relay box).
If there is no noise when the truck is not running then the noise should be attributed to the serpentine belt and or its' pulleys. |