I would also make sure there is no debris on the front or back side of the a/c condensor and front side of radiator.

The best way to clean this area is to pull the radiator so you can clean the front and back of condensor.

While the radiators out, you might want to have a shop look it over. It could be plugged up.

If you're cool at highway spped and hot at idle or driving slower, you may simply have an have an air flow issue.

Another possibility might be your water pump.

Quite frankly, there's a long list of things that can cause this and some have already been mentioned above. Put together a check list from the replies you receive here and go thru it.

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"