Technical Engine Temperature Gauge not working

[dgg]

The engine temperature gauge on the dashboard is no longer reading - it does not move from the horizontal position. Its a 2009 Fiat Ducato campervan, 100 JTD 2.2L Ford Puma engine.

No warning lights on.

The problem has been investigated by a mechanic. The problem is the gauge itself in the instrument cluster. No fault codes detected.

My question, which the mechanic could not answer, is if the gauge is not working will the red warning light come on if the engine overheats?

If the answer is yes I can manage without the actual gauge.

The red light itself works as it comes on briefly when the ignition is turned on. Whether it would come on if the engine was overheating is unknown.

The mechanic is unable to change the gauge. From a quick search online it appears that there are two options. (1) purchase a used instrument cluster or (2) take the instrument cluster out and send it away for repair.

Suggestions and ideas appreciated - thanks.

 

[lycopersicum]

Would this be any help?

Ducato X250 Sticky Needle Repair

How to repair stuck dashboard instruments

www.fiatforum.com

 

[Jockstrap]

The mechanic identified a faulty gauge. Dafty here but on what basis?

Why not replace the sensor? DIY and cheap.

Knowing nothing, but with the engine hot does the fan activate? If not to me it's the sensor.

Tuppence worth .

 

[dgg]

The mechanic identified a faulty gauge. Dafty here but on what basis?

Why not replace the sensor? DIY and cheap.

Knowing nothing, but with the engine hot does the fan activate? If not to me it's the sensor.

Tuppence worth .

I understand that if the sensor was faulty this would show up as a fault code, which it did not. Also a faulty sensor would most likely cause problems with the engine not running smoothly. The mechanic applied a signal to the gauge and it did not move. Hence the conclusion that the gauge itself is faulty.

 

[Communicator]

As already hinted by @lycopersicum , the problem is probably due to a sticking stepper motor.

I note that an identical problem was posted on the Wild Camping forum on 9th May, and remains unresolved.