stevec176 Posted April 24 Share Posted April 24 The external temperature reading has suddenly gone crazy on my 2016 Fiat Ducato Rapido. Last week when the external temperature was only about 10°C the display on the dashboard was showing about 50°C. I'm assuming it must be the thermostat which I think is in the off side wing mirror, if so how easy is it to replace please. Quote Link to comment Share on other sites More sharing options...
Robinhood Posted April 24 Share Posted April 24 This should give you some idea. I'm pretty sure you can also get the sensor complete with end connector, but that will/would entail working inside the door as well. (which can be done by removing the switch panel on the armrest, but is definitely keyhole surgery). TBH, I've only taken a broken mirror apart, and that was fiddly. Care will be needed. (FWIW, I had one fail on my previous 'van whilst under warranty, and Fiat's response to that was to replace the full mirror). Quote Link to comment Share on other sites More sharing options...
spospe Posted April 26 Share Posted April 26 The thermostat reading is for information only and has no effect on the running of the Air Conditioner system. However if you have Climate Control fitted, the thermostat is important, as its output is used to control the cooling. Quote Link to comment Share on other sites More sharing options...
onecal Posted April 26 Share Posted April 26 Hi Some will not attempt DPF regeneration if ambient temperature reading is too low or if ambient temperature signal missing/not reading. Regards Quote Link to comment Share on other sites More sharing options...
John52 Posted April 26 Share Posted April 26 Someone with the same issue here; link Quote Link to comment Share on other sites More sharing options...
onecal Posted April 26 Share Posted April 26 Hi Yes it effects quite a few models and not just Fiats Regards Quote Link to comment Share on other sites More sharing options...
Alanb Posted April 26 Share Posted April 26 2 hours ago, John52 said: Someone with the same issue here; link And perhaps here. Alan Quote Link to comment Share on other sites More sharing options...
stevec176 Posted April 27 Author Share Posted April 27 (edited) Thanks, but the links above and what I've found say that the display is not working, only showing dashes but mine actually displays a reading which appears to increase and decrease as would be expected but is greatly over reading. Last week on start up the outside temp was about 10°C but the display was showing 50°C and increased as the day got warmer. Is there a way to reset the thermostat? Does anyone actually know where the sensor is? I've just looked on line and it's either in the mirror, in the wheel arch or in the engine compartment????? Edited April 27 by stevec176 Quote Link to comment Share on other sites More sharing options...
Robinhood Posted April 27 Share Posted April 27 My problem that led to the mirror being replaced under warranty was wildly under-reading, (by 30 degrees or more) not completely failure. For a standard cab, the temperature sensor is a small "nipple" on the underside of the driver's-side door mirror (obvious when you find it - though if you have "mirrorguards" on, rather less than obvious.). The other locations are generally for A-class vehicles that don't have the standard Fiat mirrors. AFAIK, there is no reset/recalibration possible. The video I posted above showed the replacement by an aftermarket unit terminated with two bare wires, which were then joined to the existing (snipped) ones. These are readily available relatively cheaply on eBay. Despite Fiat sometimes denying it, a complete OE unit with the terminating plug is available as p/n 1375410080, which will be considerably more expensive, and will still need the mirror dismantling to fit it. (and the plug feeding through into the door, the connections being beneath the armrest switch unit, which can be levered out; access is tight but possible - and I suspect the whole door mirror might actually have to come off for that - fiddly but not to daunting). Quote Link to comment Share on other sites More sharing options...
stevec176 Posted April 28 Author Share Posted April 28 Thanks for the info RobinHood, think I might leave it for now as its not essential. Had found the sensors to buy and not costly so will probably order one ready to go. Quote Link to comment Share on other sites More sharing options...
Robinhood Posted Sunday at 12:54 Share Posted Sunday at 12:54 I have a complete spare OE sensor here, recovered from a mirror demolished for me by white-van man. I'm hanging onto it, just in case. TBH, dismantling the mirror is fiddly (I think the worst bit is removing the glass without breaking it) but from working on the broken one, I'd think it not too difficult after that. If you fit an OE sensor and have/wish to manoeuvre the plug through, then the worst bit is probably removing the Remis blind (if you have one) to reach the mounting screws. Even that isn't too bad once you've sussed how. Quote Link to comment Share on other sites More sharing options...
stevec176 Posted Sunday at 19:00 Author Share Posted Sunday at 19:00 Thanks, I'll probably order the sensor and then when time and weather allow I'll have a go. Quote Link to comment Share on other sites More sharing options...
John52 Posted Sunday at 20:52 Share Posted Sunday at 20:52 8 hours ago, Robinhood said: TBH, dismantling the mirror is fiddly (I think the worst bit is removing the glass without breaking it Yes I agree Like many things the glass is held in with plastic clips you just have to brute force pull apart and hope nothing breaks. But the mirror glass has a backing which makes it surprisingly strong and I am surprised I haven't broken one yet. I find the best way to get hold of the mirror glass is to loop a strap behind it so you are pulling in 2 places, but I have also just pulled them out with a flat bit of metal with a 90 degree bend in it behind the glass. Once the glass is out you can see how the assembly is held together. Quote Link to comment Share on other sites More sharing options...
stevec176 Posted Monday at 07:58 Author Share Posted Monday at 07:58 Had to replace both mirrors in the near side mirror last year after hitting a hidden road sign and was surprised how easy they were to replace. Quote Link to comment Share on other sites More sharing options...
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