W126 electric water circulation pump?

[LandYaghtLover]

I thought I read the diesels have these recirculation pumps, but a gaser? I ask because the other day I shut the car off but left the heat going. The heat stayed strong for a VERY long time. Much longer than any car I have ever had. My other cars would blow heat for a little while then you would notice it drop quick. If you fired up the car for just a second warm fluid would move back into the core and you would have heat for a little while again. Not the 560, heat was great for a long time.

Just curious.