Ambient Temperature Sensor

The Ambient Air Temperature Sensor is what you want , an it is located in front of the a/c condenser . remove

1. the pin-type retainers and remove the radiator sight shield

1. Disconnect the connector.

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

not same year but should be in same spot

Hi Dale. Look under the front bumper either on the left or right trim panel. The trim panels are triangle in shape. An outside temp sensor usually sits in this area. The sensor may be missing. BMW has the sensor, wire, and connector available sperately if they are missing or damaged. It will cause the outside reading to be -40 and can cause the a/c compressor not to operate.

Hi ruswashingto,

The air conditioner may not work properly if your ambient temp is reading -40. The a/c control unit monitors ambient temp so that it does not operate at too low outside temps. I would recommend fixing the ambient temp sensor and rechecking your a/c operation.

ATS is your Ambient temperature sensor.


Please don't forget to rate my answer. Thank you.

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.

there is no speedometer cable on these cars,they have wheel sensors on all wheels,check and replace senor/sensors. will also sometimes throw abs and ats lights on dash.not to difficult to change for a diy person

LOOK ON DASHBOARD AREA FOR A LITTLE BUBBLE LOOKING THING PROTUDING UP SOMETIMES NEAR WINDSHEILD

Go to Matthew's Volvo Site and search under "ambient temp sensor" I posted detailed instructions and pictures of how to fix this. Enjoy