I've mentioned this before but I'll say it again. Vehicles with 150K or more on the clock tend to have radiators that are filled with foreign material (bugs, dirt, etc.). Spraying them with a hose does not even begin to remove all of this crud. I took the radiator out of the vehicle and sprayed it with chemical cleaner and used the compressor to try and remove as much as possible. I still am looking for a proper chemical to get rid of all of it. However, after reinstalling it in the vehicle, the temperature runs about 5 degrees cooler all the time (85-95). Has not hit 100 even at 90 degree ambient with the A/C on full.

Brian Carlton
1984 300SD