W124 overheating / cooling fans?

[yosshimura]

Its nice not to have to post often in the tech area , which means no problems .....

Anyway, I have seen my temp gage max out 2-3 times recently when idling for a few minutes (ie drive through at fast food). I read through the archives and I think it might be the fans.

Here is the scenario:
- 95 W124 / new water pump & hoses about 9K miles -5 mths ago / 110K miles
- WHile driving you would not have a clue of the overheating, needle is pegged at midpoint.
- Today, I noticed , after one of these "high temp" episodes that only oneof the two fans up front was spinning. Is this right? Or are they both supposed to run at once? Makes a little sence, since when the car moves temp goes back to normal.

Once I figure out if these dual fans are supposed to run simmulanously (sp?) I can either discard that as being the problem or address it. What is the correct name for these fans?

Thanks