I was running late for an appointment so I had to jump on the freeway Friday. I had to drive a 13 mile stretch of flat and maintain a safe speed. I was turning 2,800-3,000 rpm and watched as the temp built up. When I got off at my exit I was touching 208+-. Today I flushed the rad of the old rusty green juice and ran a couple gallons of distilled through it to flush as much as I could. I replaced with 1gallon of green concentrate and a quart of distilled. On my old xj I bought a 3 pass core that really helped keep it cool. Does anyone make such a thing for the cj5? What do I have to know to order the correct one? Any other tips or tricks to keep this running cool, besides stay off the fwy?