On our 2006 Itasca Horizon w/Cummins 400 We had some temp issues out west in June. Warning temps when climbing and I had to downshift to cool things off. Got home cleaned the RAD and all looks good. Issue now is the cooling fan runs all the time on high speed....IF the AC is on. If the AC is off it runs low speed. Doing some research it seems the fan should be off until the engine reaches operating temp. Then low until nearing high temps. Is this correct?
That's pretty much what I was thinking. Low fan all the time except for high temps OR AC on.
I was reading on another forum a post from an owner who said "Freightliner said cold engine fan off to normal temp then low to high" mine has never done that.
Guess I am ok....On to Texas later this month.
AC on or off matters not fan runs on low till air and water temps get to max then fans come on to high
Well,I can guarantee you this is not the correct analysis. Ask me how I know.
That's pretty much what I was thinking. Low fan all the time except for high temps OR AC on.
I was reading on another forum a post from an owner who said "Freightliner said cold engine fan off to normal temp then low to high" mine has never done that.
Guess I am ok....On to Texas later this month.
AC on or off matters not fan runs on low till air and water temps get to max then fans come on to high
That's pretty much what I was thinking. Low fan all the time except for high temps OR AC on.
I was reading on another forum a post from an owner who said "Freightliner said cold engine fan off to normal temp then low to high" mine has never done that.
imgoin4it wrote: Not sure but I think the fan runs all the time when the acnd is on. Pretty sure mine does. In fact the engine runs a little cooler when the acnd is on,
R U talking side cooling or rear cooling here?? My 425 ISL side cooling fan works strictly by engine coolant temperature makes no difference whether AC is on or off
X2 in my 350 ISC.
Steve,Kathy and Josh Morpheus(Basenji)at Rainbow Bridge 2004 40' TSDP Country Coach Inspire DaVinci 350 Cummins, 3000 Allison 2014 Jeep Wrangler Unlimited Sport S, Air Force One Braking, Blue Ox
Gator48 wrote: On our 2006 Itasca Horizon w/Cummins 400 We had some temp issues out west in June. Warning temps when climbing and I had to downshift to cool things off. Got home cleaned the RAD and all looks good. Issue now is the cooling fan runs all the time on high speed....IF the AC is on. If the AC is off it runs low speed. Doing some research it seems the fan should be off until the engine reaches operating temp. Then low until nearing high temps. Is this correct?
Sounds like your controller is working as it should. The fan does run at low speed all the time and as the temp rises to the danger zone, the fan will speed up. The fan does run faster when the air conditioning is on. Mine runs at a higher speed even when the vent mode is selected.
imgoin4it wrote: Not sure but I think the fan runs all the time when the acnd is on. Pretty sure mine does. In fact the engine runs a little cooler when the acnd is on,
R U talking side cooling or rear cooling here?? My 425 ISL side cooling fan works strictly by engine coolant temperature makes no difference whether AC is on or off
Not sure but I think the fan runs all the time when the acnd is on. Pretty sure mine does. In fact the engine runs a little cooler when the acnd is on,
