Originally Posted by h3ffe

After seeing JonW124's thread on this subject and a few helpful PMs from him, I made these same modifications to my 87 300TD last year. I have about 7500 miles on the mods, and my experience has basically mirrored his.

On Monday, I drove back to LA from camping in the Sequoias loaded to the roof with gear and bikes on the hitch rack. I climbed to 8000 feet and back down, ambient temps were up to 105F, and I was driving up to 95 mph depending on freeway flow. The coolant temperature stayed rock solid at 80-82C. It only ever climbed beyond that when climbing the Grapevine with the AC on, where I would have been over 100C with the heater on before these mods.