What's wrong with my radiator fan

Iveco Daily IV radiator fan starts too often and too early

  • Good evening,

    on my Daily iV (65C18) built in 2009, the cooling fan starts running just a few minutes after departure with a cold engine. Anyone who drives daily knows how loud this fan is. The coolant thermometer is still at "0".

    Since I bought the vehicle used, I would like to ask the question:

    - is that normal (I hope not)?

    - does anyone know that here in the forum?


    - has anyone been able to fix that (I hope so)?

    Have a nice evening and best regards


    God created time, but he said nothing of haste ...

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    Could it be that you can hear the fan from the air conditioning cooler? Or is the air conditioning switched off?

    There are days when you lose and there are days when others win ......

  • I'll have to check it out tomorrow, but I think the air conditioning is off.

    Is the air conditioning fan that loud too? When the fan is switched on, there is a real jolt through the vehicle. Can that really be the air conditioning fan?

    God created time, but he said nothing of haste ...

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    Yes it can be. In the Iveco, all fans are driven by the engine via a viscous coupling, no electric motors. It always jerks when it engages and the fan starts. Then howl like an engine. With my 2003 it was really tough but I got used to it.

    There are days when you lose and there are days when others win ......

  • Hello everybody

    It is already the case with most Ivecos. Our vehicle is also from 2008 and has a loud, jerky fan as Dieter has already described. Strange only that the fan starts working so early (0 degrees)

    I think the fan is getting the wrong signal from the temperature sensor

    VG Leo

  • In the engine compartment I found a fan that is installed between the engine block and the radiator - i.e. behind the radiator when viewed from the front. A huge part that a helicopter can probably take off with. That the noise is making is clear. Today I recorded when the fan switched on and off.

    The fan switches on after driving approx. 2 km. The temperature is still at "0". It goes out again after about 30 seconds. Then it switches on again after another 2 km. The thermometer was just above the "0". Again for about 30 seconds. After that, the intervals between switching on became larger. When the thermometer was on "normal" - that is, just below center, the fan only switched on approx. Every 15 minutes, but then for 1-2 minutes. I let it roll on the autobahn at 100km / h, then I hung up a shovel and drove to the speedometer 110 km / h, the distances were shorter again, but the temperature display always stayed just below the middle, the needle has become not moved. So I suspect that switching on the fan has nothing to do with the coolant temperature.

    After Diego's tip, I switched the air conditioning off and on, but I couldn't see any change in the fan behavior.

    At Leo's tip, I observed the cooler temperature closely. The fan switches on and off several times while the temperature rises steadily to "normal". I think if the sensor was broken, would the fan not turn on at all or would it turn on all the time?

    What else can the fan be controlled by? I'm pretty baffled now. Before I go to Iveco - maybe someone else has a tip after all?

    best regards and have a nice weekend


    God created time, but he said nothing of haste ...

  • There is the intercooler, the water cooler and the air conditioning cooler ...

    Earth is flat and pigs can fly

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    Maybe he gets too little air. The air conditioning cooler is located where your license plate is. The shield sits awkwardly at this point. The intercooler sits behind the "Hymer" and the water cooler underneath. Is there enough fresh air coming in? What amazes me that it thunders off when the engine is cold. Normally it only does this when the temperature is around 100 degrees or when the air conditioning cooler does not get enough airflow .. The best thing to do is let Iveco clarify this

    There are days when you lose and there are days when others win ......

  • Hello Gerhard,

    Have you ever talked to the previous owner whether he knows this strange behavior of the fan?

    Or maybe there are Hymer colleagues here with the same vehicle who can report something about any problems with the air supply,

    Air inlets that are too small should also be kept in view.

    You have already created a good log of the temperature profile and switch-on and switch-off times so that even a good Iveco workshop should be able to localize and fix the error.

    I hope that you can get a grip on this "tornado fan".

    VG. Leo

  • Hello diego

    You were faster there, but in our minds we're on the same track.

    The main thing is that Gerhard gets the cow off the ice.

    A lovely evening. Leo

  • Hello Leo, hello Diego, hello WDA,

    Unfortunately, I can't ask the previous owner, he can't be reached because he's moved. Post comes back as undeliverable. But if there is another Hymer owner here in the forum who knows the problem or perhaps even describes it as "normal", then that would help me. I have identified the three coolers that WDA has described, they are all cooled by the same fan. Maybe it's because of a sensor, as Leo said. I checked the air inlets, they are all free.

    If I can, I'll go to Iveco next week.

    Thanks to you for your help and tips! Have a nice Sunday, best regards


    God created time, but he said nothing of haste ...

  • Earth is flat and pigs can fly

  • I had smoke deflectors built over the gearbox and in front of the radiator in the current Empire. In our case, the result is astonishingly good.

    The sheet metal above the gearbox prevents air from accumulating in the engine compartment. The metal sheets in front of the coolers are used for forced ventilation of the coolers.


  • Hello

    , SLN

    Could you please upload photos for this.

    Certainly interests some.

    greetings Martin

  • So that everyone can find the information in the event that the Iveco gets too hot, the pictures and information should be stored in a separate thread.

    To get back to the topic of this thread ... the problem with my Iveco is Not that it gets too hot, but that the fan switches on even though it is not yet hot. The fan switches on and off several times on the route between the cold and hot engine, i.e. regardless of the engine temperature, which actually never goes far beyond the middle of the temperature display, not even on the mountain.