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1997 Intigue Random Overheating

Yahoo Message Number: 117251

I have Cummins 325, recently I have had issues with over heating, I will be traveling along at 180, and it will jump up to 220 or so, I have pulled over and checked everything and nothing shows any issues.  I am driving on flat roads and not pulling anything.  I have been in situations where I could not pull over and it has magically dropped back down to 180 and then stayed there for the rest of the ride.  My first thoughts are with the hydralic fan for the cooling the radiator.  Does anyone have any thoughts or suggestions on troubleshooting?  Does the fan have different modes?



Don St. Croix
Canton, Ga
1997 Intrigue 10437

Re: 1997 Intigue Random Overheating

Reply #1 –
Yahoo Message Number: 117252
Sounds like you Sauer Danfoss fan controller has gone out. You need to go to a Source Engineering wax valve. They are much better, provide a linear increase in fan speed as a function of coolant temperature. Contact Source Engineering.

Greg
06 Magna

2006 Magna Rembrandt C13
2016 Jeep GC toad

Re: 1997 Intigue Random Overheating

Reply #2 –
Yahoo Message Number: 117253
How many miles on the coach?

Couple be, but less likely is a water pump issue. Before spending the money on a new fan controller, have a shop change your fan controller to always on, easy change, as opposed to dynamic.

If it still over heats it's not your fan controller.

Mark

Re: 1997 Intigue Random Overheating

Reply #3 –
Yahoo Message Number: 117254
Unplug the controller. That puts the fan on high all the time. Try it and if it still overheats, it's the controller or sensors.
Larry

Re: 1997 Intigue Random Overheating

Reply #4 –
Yahoo Message Number: 117255
As suggested, unplug the power lead to the controller. The fan should run on high all the time. Assuming the fan does run at high speed, check the two temperature sensors on the controller. One is for coolant temperature, the other for turbo charger duct temperature. Use an ohm meter to measure resistance. Both mine were open circuited and showed infinite resistance. Should see something from 50 to 2000 ohms.

You can travel with the fan on high speed all the time but it will cost you some fuel as the engine will be running colder than normal. But, better than overheating.

I had similar experience and it turned out that both sensors were bad. Replacing sensors is much cheaper than replacing the controller with either a new controller or a wax valve.

pete
2000 40' Magna CAT C-10, #5892
Pete
 2000 40'  Magna #5892  CAT C-10