It runs hot. I assume I have the 180 unit, but after 5 minutes of running it would not matter either way, since in traffic and 90 degree weather she runs 200+ F (with system additives, but I still have the original fill in there, so when I eliminate the
antifreeze and add water wetter only she may run cooler)
Use the 180, since your water is VERY likely to exceed that by at least a bit on any warm day....
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