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Ambient Air Temperature Sensor (UH9)
At the front of the vehicle, at the lower left side of the front bumper bar
Ambient Air Temperature Sensor (UH9)
Pin
Wire
Circuit
Function
A
0.35 L-GN/BK
735
Ambient Air Temperature Sensor Signal
B
0.35 YE
61
Low Reference
Does the compass work when the temperature goes out? If the compass still works then chances are that the ambient temp sensor is defective. Also, could be wiring to the sensor. If the compass goes out with the temperature then chances are the mirror itself is defective. Cheapest most common problem is the ambient temp sensor. It's behind the grill by the condenser at the front of the vehicle.
It's been a while since you asked but in the event you still have this issue - I would definitely start with testing the sensor to start and if found faulty, replace.
On my 2007 S60 T5 I experienced similarly erratic ambient temperature readings which effected my A/C operation.
While awaiting the arrival of the replacement sensor (~$15) I removed the door panels and treated the various wiring connectors to some contact cleaner and dielectric grease during reassmebly.. Despite a Volvo Service Bulletin highlighting potential problems with corroded wiring harnesses; in my case the connectors all looks clean and corrosion free - and after this exercise there was no improvement with the erractic ambient temperature readings.
Once the sensor arrived I was able to easily replace it. It took less than 15 min and required only a plastic pry bar and T15 Torex wrench. Testing the sensors with an DVM I found that the new/good sensor read 167K Ohms, while the old/faulty sensor was open with no resistance reading.
Thus on the basis of my personal experience I would recommend testing the sensor to start and if it is found to be the problem, replace. If it is not faulty then proceed with cleaning wiring harness connections.
The ambient temperature sensor going bad causes this exact problem. I've replaced many of them because when they show outside temp as being below 60 degrees, the A/C control module will shut the compressor off.
Right behind the grill around the rad. support on the passenger side (usually) there is a sensor called an ambient temperature sensor. That gives your outside temp. on your rearview mirror.
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