Ok I know this thread is 3 years old, but no point in retelling my story since it's almost identical... lol...

So here it is: W124, 1993 300CE (pre-facelift)

- Replaced thermostat
- Replaced fan clutch
- Cooling fans occasionally turn on 66% of the time both turn on when engine reaches around 105 deg. If they don't turn on I can just give them a quick tap and they will turn on.
- In stop and go, or idling traffic, engine will quickly rise to between 100 - 110 deg
- Cruising, engine will hover around 90 - 95 deg

So at this point, does a water pump or radiator replacement make sense? Is there something simpler? Thanks