I was driving up to Canada with the fam the other day and sitting on the bridge to Canada in Niagara Falls I looked down at the scanguage and saw the temp was 215!!. Considering I am dragging a 22 foot trailer across the country in 3 weeks I was a little concerned. Turned both heaters on and listened to the wife complain about how hot she was. When I got a chance to pull over it was easy to see what was wrong. All the nice new CST oil I just rebuilt my fan clutch with was all over the place, maybe next time I will leave the rebuild to professionals. In my defense however when I was rebuilding the clutch there was very little fluid (15 cc maybe) that drained out and there was some dirt that looked to have bypassed the o-ring on the clutch so I think it was trying to fail already. Figured that since the rest of the drive was freeway to Toronto we might as well continue the trip. Boy was I wrong, they decided to rip the freeway up so it was stop and go for a couple of miles. We hit a max of 227 deg with the heater on full. The factory guage only got to maybe 5/8ths and never got close to red. Also it didn't budge until 224 deg. That is quite the dead spot on the guage. My wife kept yelling at me and saying "how do you know that stupid little thing is right" refering to the scanguage and telling me to turn the AC back on. I told her that was impossible 10 deg ago. She wants a new truck. Damn women.