Air Con: - Xc90 d5 06

ian ferguson · Aug 7th, 2018, 10:31

I had the AC recharged about 2 months ago and was find until this really hot weather. When the temp knobs are turned to the fully cold position, the drivers side is blowing cold but not ice cold air, not enough to cool the cabin, and the passenger side is blowing warm air.
The clutch on the compressor is working fine. Thanks Ian

gmonag · Aug 7th, 2018, 11:15

Have you checked for DTCs? Specifically, an internal failure of the AQS (Air Quality Sensor) can upset the LIN bus and one of the symptoms is loss of temperature control to the passenger side. If you can't read the DTCs easily you could just temporarily remove the AQS and that will clear the fault, if indeed the AQS is the cause.

colinbos · Aug 17th, 2018, 21:49

Ive had aircon problems and the symptoms in some part where the same as described.

When gassed, it blew cold in all vents... a week or more later... warmer from one vent than the other,, and not as cold as when just gassed,

It appears that an escape of gas lowers the pressure enough to cause an imbalance of temperature between vents but still operates. I had it sealed by an aircon expert, but eventually the condenser blew. It was under warranty so it was replaced and works fine now. I would suspect, if its not the AQS as stated, a loss of refrigerant is the cause.

As an aside, have you tried balancing the dampers via VIDA.. just in case ?

colinbos · Aug 17th, 2018, 22:28

duplicate

ian ferguson · Sep 9th, 2018, 21:22

Apologies for not following up on this and thanks for the replies, I just got really busy and didn't have the time. i plugged in the vida dice today and got the message "no USB signal" I will try again tomorrow and update. Thanks Ian

Aug 7th, 2018, 10:31	#1
ian ferguson ian ferguson Last Online: Apr 4th, 2024 16:13 Join Date: Aug 2006 Location: London	Xc90 d5 06 I had the AC recharged about 2 months ago and was find until this really hot weather. When the temp knobs are turned to the fully cold position, the drivers side is blowing cold but not ice cold air, not enough to cool the cabin, and the passenger side is blowing warm air. The clutch on the compressor is working fine. Thanks Ian

Aug 7th, 2018, 11:15	#2
gmonag Premier Member Last Online: Jan 15th, 2024 17:24 Join Date: Jun 2010 Location: Bury St Edmunds	Have you checked for DTCs? Specifically, an internal failure of the AQS (Air Quality Sensor) can upset the LIN bus and one of the symptoms is loss of temperature control to the passenger side. If you can't read the DTCs easily you could just temporarily remove the AQS and that will clear the fault, if indeed the AQS is the cause. __________________ Greg

Aug 17th, 2018, 21:49	#3
colinbos 2008 XC90 D5 SE Last Online: Mar 28th, 2022 20:27 Join Date: Nov 2015 Location: Formby	Ive had aircon problems and the symptoms in some part where the same as described. When gassed, it blew cold in all vents... a week or more later... warmer from one vent than the other,, and not as cold as when just gassed, It appears that an escape of gas lowers the pressure enough to cause an imbalance of temperature between vents but still operates. I had it sealed by an aircon expert, but eventually the condenser blew. It was under warranty so it was replaced and works fine now. I would suspect, if its not the AQS as stated, a loss of refrigerant is the cause. As an aside, have you tried balancing the dampers via VIDA.. just in case ?

Aug 17th, 2018, 22:28	#4
colinbos 2008 XC90 D5 SE Last Online: Mar 28th, 2022 20:27 Join Date: Nov 2015 Location: Formby	duplicate

Sep 9th, 2018, 21:22	#5
ian ferguson ian ferguson Last Online: Apr 4th, 2024 16:13 Join Date: Aug 2006 Location: London	Apologies for not following up on this and thanks for the replies, I just got really busy and didn't have the time. i plugged in the vida dice today and got the message "no USB signal" I will try again tomorrow and update. Thanks Ian

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