Question about 2001 Volvo S60

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I have a 2001 S60 T5 that occasionally reports (via the dashboard gauge) that the ambient temperature is 30-40 degrees Fahrenheit lower than reality. Furthermore, my A/C has been acting strangely. I understand that the ambient temperature sensor for the dashboard gauge is under the passenger side mirror, and the corresponding sensor for the ECC is under the driver side mirror. Do I need to replace both these sensors, or should I start by removing the door panel and checking the wiring? I work on my car a bit, so I think I can handle it myself...but how do I know if it's the wiring or rather the sensors themselves? What steps should I remove the door panels, check the wiring, diagnose, etc.? Thanks

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It's either the sensor, wiring or the module that interprets the temperature, I believe.

I have a 1999 Ford Expedition that reports a false low temperature as well, It started doing this after I washed the car, and intermittently does report a temperature lower than reality.

Good luck fixing this problem.

Posted on Jul 04, 2010


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INside temp guage reads at 30-40 degrees when it is about 95 here. The air conditioning blows only lukewarm air and I am wondering if these 2 things are connected.

Had this same problem with my car, a 2001 S60 T5. It turned out to be the temperature sensors mounted beneath the exterior mirrors -- you'll see a nipple under each mirror (and you can pop it out with a screwdriver).

One of these external sensors (forgot which side) is used by the engine management system. The other one is used for the inside temp gauge.

I found that one of them (I think the one under the passenger sie mirror, but don't quote me) had popped out, leading to my weird temp readings on the dashboard gauge. So I just popped the sensor back into the bottom of the mirror, and that solved the problem. Check both mirrors, though. If the sensors seem fine, maybe pop them out and then back in...and see if that works.

If that doesn't solve your problem, then you might have to replace the appropriate temp sensor (or worst case, the entire exterior mirror). Good luck!

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