When I press on the gas to raise the rpm back to around 3000 rpm, which shifts it down one gear, the noise returns until the rpm increases above 3000 rpm, the gear shifts to the next higher, rpm goes down and noise immediately fades out.
I must add that this whistling noise can be heard clearly when the car is cold. After traveling for a long distance (specially long highway distances) this noise is very faint and sometimes it disappears completely at the said rpm values when shifting gears. But then the next morning the noise is back at exaclty these rpm values (fading away when the gear shifts). It is driving me crazy. I changed the transmission oil with no effect.
I am suspecting a bad water pump bearing is causing this, but wanted to get some opinions before going for this (warranty covered) repair. BTW, is the water pump gear-driven on the Explorer? Is replacing the water pump unit a big job, will they need to lift the engine?
have the same problem?
Thursday, January 11th, 2007 AT 5:59 PM