wcjeep wrote:
Are you sure the clutch fan is engaging? The mechanical clutch fan sounds like the truck is preparing for take off when it engages. If the temp is rising to 210 then drops without the jet engine roar it sounds like a slow to react thermostat.
My fan is super quiet, even when engaged and properly operating (checked with a DRBIII). My dads 06 fan is much louder, so I am not sure what the difference is from 05 to 06.
rhagfo wrote:
You should never be above 190 without a load! Replace the T-stat as mentioned before with a Cummins T-stat. Make sure the outside of the radiator is clean and oil free, check the water pump, simple two bolt replacement.
I only got my 01 up to 205 pulling a 7% grade on a 95 degree day running at 19,000# GCVW.
I was hitting 213° last week at 19K GCW in temps from 86°-102°.
That's pretty cool for that much weight! The thermostat isn't even full open, unless you swapped a 180° in. The 2nd gens generally run a little lower EGTs and power, so that will effect coolant temp too.
