DT466 Engine Fan behavior
Ok. So just picked up my bus and drove it home 2300 miles.
The first day and 800 miles, I must say I didn’t notice the fan come on but once. Maybe I’m making it up because I honestly don’t remember.
I cruised all day at 65mph and about 2450 rpm. Mostly - make that all flat in Louisiana and Texas. Which explains why I didn’t hear it. As I remember the temps were around 180-185°
The second day (25 hours and 1600 miles) when I got to New Mexico, Arizona and California, I noticed the engine fan was coming on during slight uphills. I thought it might be the altitude. Then started looking at the temperatures more closely. All of the starts seemed random as they would come on anywhere between 185° and 205° and off between 175° and 185°.
When I was on the flats normal temp was around 185° a 2450 RPM. When idling it went down to 165°.
So that’s the behavior. When the fan goes on, it definitely cools the water temp - visibly. I can see the gauge move until it shuts off. Then when it stops, the temp usually jumps by 5° and then slowly (not visibly) creeps back up to higher temps.
Can anyone tell me what the expected behavior is? It seems like it goes on randomly at various temperatures. Which is weird.
If this is within normal behavior then so be it. Just posing the question.
Additional info: I thought it might be the A/C but I turned it off and no difference. So I tried circulatin the heat pump trying to get the coolant to move through the system and there was no difference there either.