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Old 17-02-2017   #1
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Question Ducato 2001 2.8JTD radiator fans not turning on

Hi, I have seen a few posts about radiator cooling fans not coming on but I cannot seem to locate the temp sensor/switch.
When I am going up long/big hills in my Laika motorhome the temp gauge goes above half but returns to "normal" as soon as I going downhill or driving on the flat. I have tested both fans with a 12v source and they both work well. There is a black box on top of the radiator which contain the relays for the fans, they both seem OK. I can measure 12v on the positive side to chassis on each fan so looks like the negative is switched to ground via the relay which get a control voltage from the management system (wherever that is!) which in turn gets a "signal" from the temp sensor. I have read on other posts that the sensor is screwed to the radiator near the bottom hose, I cannot see one so now I am stuck. I think it has an Iveco engine fitted if that is any help.
Cheers,
Eric
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Old 17-02-2017   #2
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Like you, I like to know whether components are working as they should.
Like you I have a 2.8JTD motorhome conversion. You've probably got a hot water calorifier in the habitation area which heats up from the engine, and a 'blown air'? heating system,-Eberspacher possibly.
When these are installed, the normal radiator sensor wiring seems to be disconnected and re-routed somehow. Engine cooling still works however. The sensor plug on the bottom of my radiator,-the one with a big brass 29mm. hexagonal nut on my van is not connected to anything. I've only ever had the rad. fans come on after sustained 2nd. gear climbing for about 15 mins. The 2.8 has a huge radiator. I've never driven in very hot climates, maybe its different then. The needle never travels over half way between cold and hot however I drive.
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Old 18-02-2017   #3
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Hi, I have no idea what a hit water calorifier is. I cannot see any large brass nut on the radiator, whereabouts is it on yours?
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Old 18-02-2017   #4
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Something like this? http://www.ebay.co.uk/itm/Fiat-Ducato-2-3-2-8-JTD-3-0-D-Water-Coolant-Temperature-Sensor-New-46472179-/310995454129
My sensor is at the bottom left of the rad, looking from behind, i.e. UK nearside.
A calorifier is just like a small domestic immersion heater tank, connected to your engine cooling system? http://www.ebay.co.uk/itm/10-Litre-VERTICAL-Surecal-Calorifier-calorifiers-water-heater-/361562480831
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Last edited by blaven; 18-02-2017 at 08:02.
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Old 18-02-2017   #5
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by blaven View Post
Something like this? http://www.ebay.co.uk/itm/Fiat-Ducato-2-3-2-8-JTD-3-0-D-Water-Coolant-Temperature-Sensor-New-46472179-/310995454129
My sensor is at the bottom left of the rad, looking from behind, i.e. UK nearside.
A calorifier is just like a small domestic immersion heater tank, connected to your engine cooling system? http://www.ebay.co.uk/itm/10-Litre-VERTICAL-Surecal-Calorifier-calorifiers-water-heater-/361562480831
Thanks for that, there is no heater of that type in the motorhome. The home has hot air heating but comes from the hot water heater. I cannot see any sensor on the near side of the radiator. I assume it would be on the back of the rad not the front. There are no cables coming out of the rad area so I am guessing the sensor must be on the engine block somewhere?
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Old 18-02-2017   #6
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Re: Ducato 2001 2.8JTD radiator fans not turning on

If it's any help you can check the fan operation from within Multieuscan software via the control activation function for checking various circuits and instruments etc.
Like others, I've never heard the fans running despite fully loaded hill climbs and lengthy periods in traffic and can only put it down to the large coolant volume and lower diesel engine heat dissipation. Maybe they designed it based on summer Italian temperatures! I stick some cardboard over the radiator in the winter to try and get the motorhome heater going.
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Old 18-02-2017   #7
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by toyogran View Post
If it's any help you can check the fan operation from within Multieuscan software via the control activation function for checking various circuits and instruments etc.
Like others, I've never heard the fans running despite fully loaded hill climbs and lengthy periods in traffic and can only put it down to the large coolant volume and lower diesel engine heat dissipation. Maybe they designed it based on summer Italian temperatures! I stick some cardboard over the radiator in the winter to try and get the motorhome heater going.
Mmm, no idea what Multieuscan software or the control activation is. The temp gauge has gone over half way recently when climbing big hills and sat in traffic on a warm day (30 C) day. It soon came down again, just a bit worried that if am sat in a traffic jam and it starts to overheat and the fans don't turn on.
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Old 19-02-2017   #8
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Multieuscan is a software package which "talks" well with pre obd2 Fiats. Mine is about 2005 vintage and it works fine with the dongles that plug into the diagnostic port. You load the actual software onto a Windows computer.
Speak to Gendan.co.uk they are very helpful. Within the software you can run tests on things like instruments, dash lights and cooling fans etc and get live data. Someone on this forum has mentioned using AlfaOBD app on a mobile phone with a Bluetooth dongle but don't know if you can activate the fans etc.
You can get a free version of Multieuscan which has limited functionality. Hope this helps.
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Old 19-02-2017   #9
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Re: Ducato 2001 2.8JTD radiator fans not turning on

I had a similar issue and I found the problem was the female connector pins that connected to the switch at the bottom of the rad. Initially the connectors 'looked' ok but closer inspection showed that the part that grips the male pin had rusted off and disappeared, hence a very loose fit. I removed the sensor and soldered new wired on to the pins, sleeved them, refitted the sensor and then crimped the new wired to the loom wires.

The fans should run if you just leave the engine idling for long enough.

andytw
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Old 20-02-2017   #10
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by andytw View Post
I had a similar issue and I found the problem was the female connector pins that connected to the switch at the bottom of the rad. Initially the connectors 'looked' ok but closer inspection showed that the part that grips the male pin had rusted off and disappeared, hence a very loose fit. I removed the sensor and soldered new wired on to the pins, sleeved them, refitted the sensor and then crimped the new wired to the loom wires.

The fans should run if you just leave the engine idling for long enough.

andytw
Thanks for that. The problem is I cannot see any sensor fitted to the radiator. I have crawled under the vehicle and I cannot see any wiring loom coming from the radiator only the ones that go to the fans. If you still have the vehicle and could take a pic and post it on the forum that would be great.
Eric
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Old 20-02-2017   #11
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by andytw View Post
I had a similar issue and I found the problem was the female connector pins that connected to the switch at the bottom of the rad. Initially the connectors 'looked' ok but closer inspection showed that the part that grips the male pin had rusted off and disappeared, hence a very loose fit. I removed the sensor and soldered new wired on to the pins, sleeved them, refitted the sensor and then crimped the new wired to the loom wires.

The fans should run if you just leave the engine idling for long enough.

andytw
Just a had a look on eper and for the model/type I have the switch/sensor isn't fitted to the radiator. No idea how the fans are supposed to turn on! Might be something to do with it being a motorhome?
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Old 20-02-2017   #12
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Re: Ducato 2001 2.8JTD radiator fans not turning on

UPDATE.
I have researched eper and there is a coolant temperature sensor mounted on the thermostat housing on my particular type of 2.8 JTD , part number 99455420. anyone know if this is the sensor for the temp guage or would this be the sensor to tell the management system to turn on the fan/s?
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Old 20-02-2017   #13
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by Erc1958 View Post
UPDATE.
I have researched eper and there is a coolant temperature sensor mounted on the thermostat housing on my particular type of 2.8 JTD , part number 99455420. anyone know if this is the sensor for the temp guage or would this be the sensor to tell the management system to turn on the fan/s?
Simple things first. Have you checked that the fans aren't seized - common problem, turn them by hand (ignition off) to check. Have you got 12V at the fans afaik the relay switches the earth.
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Old 20-02-2017   #14
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by corcai View Post
Simple things first. Have you checked that the fans aren't seized - common problem, turn them by hand (ignition off) to check. Have you got 12V at the fans afaik the relay switches the earth.
Yep, done all that. If you look at my original post, there is 12v on the fans. 12v to the relays and if I disconnect the fans and apply 12v direct the fans turn no problem.
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Old 20-02-2017   #15
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by Erc1958 View Post
Yep, done all that. If you look at my original post, there is 12v on the fans. 12v to the relays and if I disconnect the fans and apply 12v direct the fans turn no problem.
Sorry missed that was on the phone browser earlier.

You can test the temp sensor its an NTC should be around 2k Ohms at 25C and 300 Ohms at 80C.
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