As Beaver documented in THIS THREAD
, the water/coolant pumps (part number 26600012) in the Rushmore's are prone to failure, and now have been listed as "obsolete" with no replacement in HDNet as of this writing. Only one place had one near me and it was about $433, but I could not see spending that for an "obsoleted" part that is known to fail. No one knew when a replacement would be made available. There is a Bosch pump that is almost identical, but the endcap is different in that the electrical connection comes out of the end were it would interfere with the engine guard and maybe the frame, the HD one comes off the side.
SO as I mentioned in that thread, on the way to work I saw the amber engine light and red temperature lights come on, I was in a place I could not safely stop, and by the time I got it stopped I saw this on the Power Vision, the coolant was ambient temp at ~60* but the engine was at 266*. Definitely no water flowing, and the fans were blowing cold when forced on by rolling the throttle.
I nursed it home, not allowing the engine to get above 240-250ish. That evening I pulled the cover off, then the plug off the pump, I tested for voltage at the connector, all was good:
I already knew of the limited availability of the pump, so I decide to tear into it...what did I have to loose?
The screws in the endcap are potted, so after digging that out they appeared to be Torx, but smaller than a #10 so that must be some oddball screw. So I decided to make them "slotted" screw with the Dremel tool and a thin cutoff wheel. Nothing to loose right?
When I got the cap off, I looked all around closely and wonder why the hell a water pump need to be this complicated, really? But anyway I saw what appeared to be a set of contacts that was not closed together like the other similar ones were, hmmmm, could it be this simple?
Continued in next post: