Sometimes when I've been going up hill for a while and the engine temp gets hot (EOT ~230) I hear a super loud screaming fan start and typically run for a few minutes and then turn off as the temp drops. The first time I heard it, it was pretty disconcerting.
I'm wondering exactly what fan that is and where it is located and if that's a normal howling when it's on. Is it the engine or tranny fan? (I didn't track the tranny temp) Are quieter one's available?
Ha Ha! I just went through the Teton Pass as well when it howled for a longer time than normal. I have a ScanGauge that I programmed to show both ECT and EOT to make sure the heat exchanger isn't getting clogged up.
Sounds normal to me. With EOT at 230, still within normal range, the fan clutch is probably fully engaged which is jet loud above 2500 RPM.
Nothing says, "yes, I have a 6.0, in a van" more than scaring children with your fan.
I'm thinking there is a new discussion/debate on hood louvers on the horizon.
2005 SMB RB 4x4 6.0 PSD
A rocket on the pad is safe,
but it's not what rockets are built for.
I had mine come on climbing Wolf Creek Pass one day just before overtaking a cyclist peddling up the same road. He thought I had done something intentional to mess with him and he turned around to flip me off. It's not like I was rolling coal or anything. Just a really loud fan working as designed on the 6.0L diesel.
All things being equal - fat people use more soap.