One side heating ?

[TruckbusUK]

Originally Posted by TruckbusUK

AQS for my 2009MY was 31348901, cost was £79.63 + vat

Got it from FRF using the C3 code for the forums discount.

Best check, but I would think/guess all the post facelift cars use the same sensor.

Correction, dont know how I wrote that part number down, it was on the invoice in ink in my writing ... prob me I think why I dont know ....

The correct info is

The old part - 31250722

The part FRF supplied to replace it was - 31418053 and the box description was Givare .... sensor?

Sorry about that.

[John Brennand]

Cheers - waiting on a reply from FRF re price and availability.

Pretty sure it is this now as I just checked and the passenger heated seat is not working either and the switch lights are on.

[cheshired5]

The cheapest way to check is to unplug the AQS.
If heating returns to normal, it was the AQS.
You don't need to buy and fit a new AQS to diagnose.

[John Brennand]

Thanks cheshired5, good idea. I will give it a go.... once I can find some scuttle clips (see my other thread).

If the heating returns to normal, are there any major downsides to just leaving it disconnected?

Cheers John

[cheshired5]

Originally Posted by John Brennand

If the heating returns to normal, are there any major downsides to just leaving it disconnected?

You just don't have AQS so if you're in a smokey/polluting traffic environment, you'll need to manually recirculate the air with the button on the climate unit then press again to return to fresh air intake when ready rather than it being done automatically.

[gmonag]

Originally Posted by John Brennand

Further digging finds the thread below - where Clan and others state....

"The AQS will not be the cause but likely to be i wouldn't know about that , but his first problem with blowing too cold one side has nothing to do with the AQS just about all the cars fitted with them over 8 years old have the AQS failed fault code and contunue to work properly . The fault is probably a faulty driver's side air temperature flap motor"

Any thoughts on that chaps?

https://www.volvoforums.org.uk/showthread.php?t=246271

AQS does not have anything to do with heating system BUT, an internal fault may/will cause the LIN bus to go down which WILL affect pax side heating and seat heater.

[John Brennand]

Originally Posted by gmonag

AQS does not have anything to do with heating system BUT, an internal fault may/will cause the LIN bus to go down which WILL affect pax side heating and seat heater.

Thanks again Greg, that's what I am going to test, as soon as I can find the scuttle clips :-)

[TruckbusUK]

Originally Posted by gmonag

AQS does not have anything to do with heating system BUT, an internal fault may/will cause the LIN bus to go down which WILL affect pax side heating and seat heater.

I concur, exactly what happened to me, AQS replaced and all back to normal.

[John Brennand]

Good call fellahs! Got the job done today, disconnecting the AQS was surprisingly easy after I eventually got the wiper arms off.

All heating restored to the passenger side - happy Mrs Brennand :-)

I may replace it if I can get a cheap one from a breaker - but not worth it for the £250 the main dealer quoted.

For reference the AQS volvo part number on my model is shown below.

[gmonag]

Buy the Hella brand - it is the same, eg.

https://www.autodoc.co.uk/car-parts/oem/30676508