Defective fan clutch. Start looking for a regular, thermal replacement. NOT a "Severe Duty", NOT a "Centrifugal". Probably not a "Heavy Duty"; unless your vehicle calls for one.
Yeah I have the steel blade. So I could simply swap in an 11 blade plastic one? What specific model do those come from or is that an aftermarket option that I can snag. Would it also be direct swap? Sounds a lot easier than the actual e-fan conversion.
Based on your complaint of the fan being engaged long-term when cold, you're about to change the wrong part.
You most likely need a new fan clutch, not a new fan. And not an electric fan conversion.
Perhaps $65. O'Reillys lists two Murray clutches, one for '96 Tahoe with A/C and HD Towing Package, another a few dollars less for vehicles without A/C. I admit being surprised that they're suggesting a "severe duty" clutch at all.
I was wrong in my earlier post.
There's also the AC-Delco fan clutch, which in the very poor photo appears to be the exact same thing as the Severe-duty Murray in a different box, at triple the price.
Four bolts fan-to-clutch, one bigass nut holding the clutch to the water pump. (36mm on my Trailblazer, maybe the same, maybe different on your Tahoe. O'Reillys loans the special tool set for fan clutches at no end cost--you "buy" it, when you return it they refund your money.
Maybe you also have to pull the rad shroud or something like that...but I suspect not.