220 does seem high, but be aware that you can expect temps in the 206-212 range when pulling long or steep grades and Cummins is good with that. My '04 ISL routinely hit 206+ on steep hills & hot days. The fan didn't even cut over to its highest speed until around 206. Both Cummins and Freightliner said "working as designed".
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
|