Aircon malfunction, does what it wants, its like sitting in a fridge..

[dave828]

Started the car this morning & the A/C set itself onto full power at 18degrees, both sides
Then a beep & "Ambient temperature sensor fault"

Ill get a sensor & fit it myself, but can someone tell me where the sensor is?
Thanks people
D

[jmkent]

I think its behind the small lines in the trim above the glovebox

[CAB]

Originally Posted by jmkent

I think its behind the small lines in the trim above the glovebox

Think that's passenger side humidity sensor, mines been faulty for ages according to planet but doesn't stop aircon/heating working and it's never been logged as a fault by the car, plus dealer can't get replacements.


Whats the sensor in centre of dash in front of the grill for clearing the screen called???????

[jmkent]

Isn't the one on the dash for the position of the sun or something.... is linked to air con, but don't know if it does temp too

I thought that what now turns out to be the humidity sensor (as now learnt ) would have been able to do both.

[magma1974]

both dont stoped air con

[Karl68s]

In the manual it's referenced as :-Temperature and humidity sensor.
But I can't see why that would make the aircon come on like that.
Could it be the external temp sensor thinking you have parked on the Sun

[citralex]

Wish mine would , I have a C5 est and my wife has a 307 sw the aircon on both now fails to work . Does the aircon stop working when the outside temp drops below a certain temp ? With two dogs we could do with it to dry the car out . As usual , all advice gratefully received .

[dave828]

Drove a few miles today, then the warning appeared again & the blower went to full & i watched the temperature on the MFD drop degree by degree, down to 18

"Ambient air temperature sensor fault" on the MFD like last time

Also, its measuring the outside temperature perfectly fine.

[battlestar]

Cant you turn off the automatic aircon and just adjust the temp yourself?

[jmkent]

Originally Posted by dave828

Drove a few miles today, then the warning appeared again & the blower went to full & i watched the temperature on the MFD drop degree by degree, down to 18

"Ambient air temperature sensor fault" on the MFD like last time

Also, its measuring the outside temperature perfectly fine.

Do you mean the temperature setpoint dropped degree by degree, or the outside temperature reading? If the setpoint, this is only changed by pressing the button... the button isn't stuck in by any chance?
BTW, the "temp" setpoint isn't directly related to temperature, and instead to comfort levels

Originally Posted by citralex

Does the aircon stop working when the outside temp drops below a certain temp ?

Doesn't come on if temp is below 5degC

Originally Posted by battlestar

Cant you turn off the automatic aircon and just adjust the temp yourself?

All automatic does is control the speed of the fans and the air flow out of each outlet.... it doesn't adjust temperature settings at all