My 96 Suburban ran at 210 all the time with the 7.4, towing or not. I sold it and just got a 01 Yukon XL 8.1. It runs around 175 degrees 90% of the time and it got up to maybe 190 when towing up some steep hills. Is this normal? It seems too low. I'd rather have it too low than too high, but it just seems too low.