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Old 20-02-2017   #16
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by corcai View Post
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.
OK thanks for the info. My next quest is to locate the sensor. I have had a look and so far with no joy. Looks like it is on the thermostat housing but I can't even locate that as yet!
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Old 22-02-2017   #17
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by corcai View Post
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.
UPDATE.
O.K. there are two "sensors" mounted to the thermostat housing on eper one is listed as a sensor and one as a "sender" I removed the sensor, tested it and it tested as you suggested above. However the sender is open circuit when cold or hot. The part number is 4837950 which if I Google comes up with coolant temperature sensor so I assume this is the problem? Also does anyone know which coolant I should use as most of the coolant drained when I removed the sensors(s). Cheers
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Old 22-02-2017   #18
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Re: Ducato 2001 2.8JTD radiator fans not turning on

FURTHER UPDATE:
On further investigation on the make up of the sender, I was testing it incorrectly. The body of the sender is the negative connection. The two spade terminals have 12v and approx 7v on them. Looking at onlinecarparts.co.uk site regarding this sender there is a little diagram on how it works. Part number 4837950. I ended up shorting both connections and at the same connected them to ground. Fans still didn't turn but a little red thermometer symbol appeared on the dash display, not the temp gauge, that didn't move. Now I am at a loss on what to look for next. Can't seem to find any other sensor near or on the cooling section of the engine. Any further help from anyone would be greatly appreciated.
Cheers
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Old 22-02-2017   #19
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Re: Ducato 2001 2.8JTD radiator fans not turning on

That a combined ntc and switch, the switch operates at 107c to put on the light, the ntc is between one of the terminals and the body.
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Old 22-02-2017   #20
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by corcai View Post
That a combined ntc and switch, the switch operates at 107c to put on the light, the ntc is between one of the terminals and the body.
Yes, I thought that was the case, but I have shorted both terminals to the chassis and the only thing that happened was the temp light came on. When I took the sender out and applied heat via a heat gun and measured the resistance across the terminals the resistance went to zero when the unit got hot ( didn't know what temperature it was) so I thought shorting both terminals to the chassis one by one and then both at the same type would turn the fans on, it didn't. There must be another temp sensor/ sender somewhere but I cannot find it.
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Old 22-02-2017   #21
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Re: Ducato 2001 2.8JTD radiator fans not turning on

If you trace back he wires from the fans there should be a box like this I believe with the relays inside.





Signals for the relays should come from pins 19 & 20 on connector on the ecu and the 99455420 temperature sensor should go to pins 84 and 85.



Does yours have air conditioning and there is also a resistor inserted in the fan cowling.

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Old 22-02-2017   #22
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by corcai View Post
If you trace back he wires from the fans there should be a box like this I believe with the relays inside.





Signals for the relays should come from pins 19 & 20 on connector on the ecu and the 99455420 temperature sensor should go to pins 84 and 85.



Does yours have air conditioning and there is also a resistor inserted in the fan cowling.

Yes, I have had the box that contain the relays apart and as far as I can tell they are OK. They both have 12v on them. I do not know where the ecu is situated, could you please advise? I am pretty sure the temp sensor 99455420 is just for the temperature guage on the dashboard unless you know different. The vehicle does not have air conditioning, is the resistor on the fan cowling only fitted when the vehicle has air conditioning?
Thanks.
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Old 23-02-2017   #23
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Re: Ducato 2001 2.8JTD radiator fans not turning on

If it's like my 2.8jtd 244 the ECU is mounted on the inner wing inside the engine compartment on the RHS when looking at engine from front (near side)
Hope this helps.
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Old 27-02-2017   #24
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Re: Ducato 2001 2.8JTD radiator fans not turning on

Quote Originally Posted by toyogran View Post
If it's like my 2.8jtd 244 the ECU is mounted on the inner wing inside the engine compartment on the RHS when looking at engine from front (near side)
Hope this helps.
Thanks
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