The Article talks about the Puller Fans,
These are the Radiator Fans,
Well, GM have forked up on these !!!
Being I had a replacement radiator to install, as the original Radiator started weeping at the rear of it, at the bottom,
hence why I could always smell glycol after I switch the car off,
I sort of figured, the Car has done a few K's now [197,200 k/s], and the fans pull a bit of heat through the radiator,
and when its running at normal temp,
Keeping in mind the Fans will still be spinning with the wind/air flowing through the front of the car while driving
I recently noticed a vibration when idling and the Fans were on, and it also appeared only when the A/C was on,
And when I turn the car off, I could feel this vibration slowing/winding down.
With much manually diagnosing, I found it was the Radiator Fan motor on the Drivers side was the cause of the noise and vibration,
So I ordered the 2 Fans, [as another JC member mentioned a little while back they are still available]
While I was replacing the Radiator, I also replaced the Fans Motors,
All went back together perfectly and no leaks and is nice and quiet again.
Me being a bit inquisitive,
I decided to pull the faulty/noisy motor apart to see if I can replace the Bearings, simple job, a couple of small bearing,
WRONG !!!
Well the front Bearing is replaceable, however the back bearing is Bronze Bearing, and that was the one causing the noise,
They have 4 Brushes, so they are a very efficient motor, but the Rear bearing is the failure of these,
Being they are $170 ea Delco Part# 19355766 they are the same for Both Sides, VE Series 2 and VF Series 1 & 2
*** VE Series 1 and VE Series 2 Fan motors ARE NOT THE SAME ***
But
The Fans Blades are Different, there is a Left and Right one,
so if you replace the Motors, write on one of the Blades in Black Texta "L or R" Before dis-assembling the units,
which ever one you wish to mark accordingly.
Also they are not really made to pull apart, they have expansion pressing to hold them together, but such a waste, because they are well made.
Sorry for the Rant, but it may ease some one else's frustration if trying diagnose a fan vibration.