Technical cooling problems

[Steve kinelarwi]

My Ducato motorhome has developed a problem, temperature guage hovers just above 50, but the Red light on the dash keeps coming on.Main fan activates at 90 but the secondary doesn't.
Oil is 10.40 semi.
Both relays have been replaced.
Fuses ok.
Coolant ok
The van is 1997 14 mwb 8140.67 230 bdmab.
can anyone help a poor old chap in distress.

 

[corcai]

My Ducato motorhome has developed a problem, temperature guage hovers just above 50, but the Red light on the dash keeps coming on.Main fan activates at 90 but the secondary doesn't.
Oil is 10.40 semi.
Both relays have been replaced.
Fuses ok.
Coolant ok
The van is 1997 14 mwb 8140.67 230 bdmab.
can anyone help a poor old chap in distress.

Secondary fan is usually seized as under normal operation they never come on.

You say the gauge hovers at 50 but the fan activates at 90 did you take out the switch to test it at 90?

Have you got a thermometer to check actual temperature of the head, block, hoses.

 

[Clonman]

|Hi

I had issues with my Fiat Ducato motorhome fan some time ago, it just wasnt comming on and when in traffic the engine was over heating. After a lot of time and money spent including taking the ECU out and having it sent away for testing and it returning without fault I finally with some help discovered what was happening. The fan motor connections had some corrosion on them and I dont think this would be an issue with a normal fiat ducato but because these vechicles are parked for a while and often in damp locations this can happen.

My advice is for you to check if fan motor is working and if it is check all fan motor connections for signs of corrosion.

J

 

[andytw]

Had issues with a '98 Boxer which may be similar. i.e. Overheat light coming on and fans not activating.
The connections to the switch on the radiator were broken. When I took the plug off the radiator switch and looked into it then it looked fine, 3 terminals all present and correct. However, on closer inspection the connections were missing the gripping part of the female connector so they were not gripping the male part of the switch on the radiator.
To resolve, I soldered wires to the radiator switch and wrapped it in rubber tape and then cut off the faulty loom plug with its faulty pins and then crimped the wires from the switch directly to the loom. All good after that.