My 5.9L Cummins won't warm up to normal operating temp. It will only approach normal and sometimes get to normal at highway speed. Anything below that, engine temp hovers around the low mark on the gauge. Heat in the truck is good. Not hot when engine temp low, but good. It's winter here as well.
I put a new thermostat in with no change. The fan belt is new. All pulleys appear to be turning well. I suspect it may be the clutch fan.
Any suggestions that I may not have thought of?
I put a new thermostat in with no change. The fan belt is new. All pulleys appear to be turning well. I suspect it may be the clutch fan.
Any suggestions that I may not have thought of?
Dec 12, 2007 at 7:15 AM
