In so. calif, both our 300SD temperatures routinely can run 100-110 especially with AC on in city traffic, with coolant fan on, new radiator, and new water pump, thermostat. The dealers here say that there's nothing much more that can be done, although it makes me uncomfortable to park a car with the temp at 110C

I understand that removing the thermostat does NOT help improve the circulation, even though there are some indep mechanics here that'll drill holes in the side of the thermostat to improve flow.

Has anyone tried installing an aftermarket second aux fan on a 300SD or any W126 and has it helped? Sounds like this water wetter stuff helps...where can I buy some?

Seems like the engine runs a lot hotter with the new R134 retrofitted AC? anyone else experienced it?