Ambient temperature sensor.

John97Tdi · Dec 9th, 2019, 14:22

Hi, the dashboard ambient temperature display on my '06 XC70 seems to have become 'political' in the last few days in that it has developed a very casual relationship with the truth and is showing 10 degrees or so lower than the actual temp.
Do the readings from the sensor in the drivers mirror affect anything else in the car,or can I safely put it on the 'to do' list for when it's not going to rain for the forseeable future?

Cheers

John

oragex · Dec 9th, 2019, 14:44

I believe the temperature on the dash is indeed measured by the sensor in the left mirror (at least on LHD cars). This sensor is also used by the engine management, so good idea to have it replaced. Some say there's also a second sensor in the right mirror, but not sure.

Spike56 · Dec 9th, 2019, 20:54

When I bought my S60 the display was at least 10degrees out. It felt like it affected the engine tickover as well as the a/c heat levels. It was a quick job for Volvo to replace the sensor (passenger mirror- small knob below the mirror near the hinge) Not too expensive and probably an easy DIY fix.
As stated, it must be used to inform the engine management system what the outside temperature is and adjust the running accordingly.

Dec 9th, 2019, 14:22	#1
John97Tdi Master Member Last Online: Apr 24th, 2024 20:29 Join Date: Feb 2007 Location: Rochdale	Ambient temperature sensor. Hi, the dashboard ambient temperature display on my '06 XC70 seems to have become 'political' in the last few days in that it has developed a very casual relationship with the truth and is showing 10 degrees or so lower than the actual temp. Do the readings from the sensor in the drivers mirror affect anything else in the car,or can I safely put it on the 'to do' list for when it's not going to rain for the forseeable future? Cheers John

Dec 9th, 2019, 14:44	#2
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	I believe the temperature on the dash is indeed measured by the sensor in the left mirror (at least on LHD cars). This sensor is also used by the engine management, so good idea to have it replaced. Some say there's also a second sensor in the right mirror, but not sure. __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c

Dec 9th, 2019, 20:54	#3
Spike56 Master Member Last Online: Yesterday 15:44 Join Date: Feb 2013 Location: Orpington	When I bought my S60 the display was at least 10degrees out. It felt like it affected the engine tickover as well as the a/c heat levels. It was a quick job for Volvo to replace the sensor (passenger mirror- small knob below the mirror near the hinge) Not too expensive and probably an easy DIY fix. As stated, it must be used to inform the engine management system what the outside temperature is and adjust the running accordingly.

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