Cold air only+heated seat u/s passenger side.

[dwaine dibbley]

For the past few weeks my car, XC90, 2004, 51000miles which I have owned for nearly seven years, has only blown cold air out of the passenger side, drivers side is ok. And the heated seat has refused to work passenger side as well.
I have been trying to get to the bottom of the fault without resorting to main dealer help, primarily I'm being tight, the car is really getting too old to be paying £100 an hour labour.
There was power getting to the seat, but none coming out, I'd read on this and other Volvo forums that similar faults had been cured by replacing the seat module, I tried this, didn't work.
I also took the glove box out, and by moving the heater control arms manually that are attached to the stepper motor I could get hot air to come out of the passenger side, further investigation showed that the stepper motor wasn't even trying to move, so I thought I had found the cause of the no heat problem. Replaced the stepper motor, guess what? Still not working, Doh!
I should also mention that the only fault codes showing on my PPC reader were for the headlamp washer relay which I had taken out years ago, didn't like them squirting unnecessarily on a clean car. Then yesterday a fault code came up that hadn't before CCM DD00 Lin Bus1, and also CCM 0040 air quality sensor, I don't have VIDA, to be honest I'm not very good with laptops etc, I doubt I could work it.
I was lay awake last night thinking about this problem it was bugging me, and I remembered that a number of years ago I had changed the air quality sensor for one of the cheap Chinese branded VW ones that had been recommended on this forum, it has/had worked without fault until I saw this code yesterday, luckily I had kept the old faulty genuine Volvo one, so popped out the Chinese one and put the duff Volvo one in, cleared the fault codes and hey presto hot air passenger side and heated seats, result!
Not too sure what had been going on, still don't understand how the sensor affects the seat and air temp' on one side only, can only assume the cheap sensor has been creating all the problems with rogue signals.
Must recommend Simon at XC90 heaven in Warrington for good prices/quick service.
If anyone needs a stepper motor part No 30676510 or seat module part No 30710362 give me a shout, going cheap not needed now.
Just thought I would post this in case somebody is having similar problems to help them, after all it what these forums are for, to help/inform.

[Acer]

Originally Posted by dwaine dibbley

For the past few weeks my car, XC90, 2004, 51000miles which I have owned for nearly seven years, has only blown cold air out of the passenger side, drivers side is ok. And the heated seat has refused to work passenger side as well.
I have been trying to get to the bottom of the fault without resorting to main dealer help, primarily I'm being tight, the car is really getting too old to be paying £100 an hour labour.
There was power getting to the seat, but none coming out, I'd read on this and other Volvo forums that similar faults had been cured by replacing the seat module, I tried this, didn't work.
I also took the glove box out, and by moving the heater control arms manually that are attached to the stepper motor I could get hot air to come out of the passenger side, further investigation showed that the stepper motor wasn't even trying to move, so I thought I had found the cause of the no heat problem. Replaced the stepper motor, guess what? Still not working, Doh!
I should also mention that the only fault codes showing on my PPC reader were for the headlamp washer relay which I had taken out years ago, didn't like them squirting unnecessarily on a clean car. Then yesterday a fault code came up that hadn't before CCM DD00 Lin Bus1, and also CCM 0040 air quality sensor, I don't have VIDA, to be honest I'm not very good with laptops etc, I doubt I could work it.
I was lay awake last night thinking about this problem it was bugging me, and I remembered that a number of years ago I had changed the air quality sensor for one of the cheap Chinese branded VW ones that had been recommended on this forum, it has/had worked without fault until I saw this code yesterday, luckily I had kept the old faulty genuine Volvo one, so popped out the Chinese one and put the duff Volvo one in, cleared the fault codes and hey presto hot air passenger side and heated seats, result!
Not too sure what had been going on, still don't understand how the sensor affects the seat and air temp' on one side only, can only assume the cheap sensor has been creating all the problems with rogue signals.
Must recommend Simon at XC90 heaven in Warrington for good prices/quick service.
If anyone needs a stepper motor part No 30676510 or seat module part No 30710362 give me a shout, going cheap not needed now.
Just thought I would post this in case somebody is having similar problems to help them, after all it what these forums are for, to help/inform.

Thanks for the advice. Presumably you still need a new air sensor, as the original one is now back in the car? You must hardly drive the car with mileage like that .

[dwaine dibbley]

Yes you are right, don't use it too much, it had 19000 on when I bought it.
It does need a new sensor, but for the price of a genuine one, I will put up with that feature not working, I'm quite sure there are lots of older Volvos running around with that sensor fault.

[Acer]

Originally Posted by dwaine dibbley

Yes you are right, don't use it too much, it had 19000 on when I bought it.
It does need a new sensor, but for the price of a genuine one, I will put up with that feature not working, I'm quite sure there are lots of older Volvos running around with that sensor fault.

Is that sensor easy to install?

[dwaine dibbley]

Quite easy, it's located in the main air intake passenger side, fiddly but easy, remove wiper arms then unclip plastic scuttle panel (6 clips) under windscreen, then black plastic shroud over intake, look into intake you will see fan at bottom, if you feel at the front (engine side) in air intake you will feel sensor, it turns 90degrees to the right to release, a bit like inserting a light bulb, make sure you remove fibre washer off old sensor and refit onto new one, otherwise it's not a tight secure fit.
Sounds complicated, but once you see it, it makes sense.

[brio007]

Hi there,

I am having the same problem with the cold air & no heat to passenger side seat?

I bought and fitted the Chinese air quality sensor but its not changed my issue?

I've not tried anything else so any advice would be really appreciated!!

Thanks!
Brian.

P.S Its a 2005 XC90.

[Piers1956]

Well that was a stroke of luck for me. Thank you. I have spent nearly 2 weeks putting a 2006 V70 D5 back to it's former glory. Too many issues to list but safe to say over 20 fault codes to sift through.

1 of them being 0048 AQS. An old friend my mine and usually ignored as I don't rate the sniffer dog as it prefers screenwash to diesel fumes or London smog. However on this car I wanted to try and rectify everything.

I have failed. 0048 gone but in it's place DD00. SNAP!

Passenger seat no longer heating. Scanner shows driver's seat switching fine as it did yesterday with passenger seat. I'll probably find the cold air left/warm air right later but I drained down this morning for antifreeze coolant change so won't know until later.

Although it might be coincidental I also had codes 6663 6664 and 6665 yesterday. This morning I did a resistance check on all glow plugs and 1-4 were perfect 5 was iffy. I don't have any of those codes but P0000 has arrived. Nothing else touched this morning so has the AQS caused this as well??

I'll rip the scuttle out again in a minute and put an 0048 failure sensor back in. I have 4 of them and now 2 DD00 sensors.

Why don't the con rods just burst through the crankcase and give me something tangible to play with.

Thanks again, it's comforting to know I don't stand alone.

I have changed the AQS over to one with a known 0048 failure code and not a DD00 code. the passenger seat is working again and the blowers are good. For those interested I recorded.

Seat o/s 34.2c (My backside on it)
Seat n/s 28.5c
Floor Vent o/s 31.0c
Floor Vent n/s 31.6c
Face Vent o/s 37.5c
Face Vent n/s 38.3c
Screen Vent o/s 27.2c
Screen Vent n/s 26.6c

The heater matrix on this car was blocked solid with Bars Leaks when I acquired it and has been flushed through with firstly Coke-Cola and then White Vinegar at boiling point. Many times. Easier than removing a matrix from a RHD V70.

Moral to the story...If your n/s heated seat and n/s heater pack up, fit a duff AQS (0048).

[SwissXC90]

Originally Posted by Piers1956

Moral to the story...If your n/s heated seat and n/s heater pack up, fit a duff AQS (0048).

But... with VIDA you can see all of that without removing anything.
And quickly come to the conclusion that the LIN bus is down and the likely culprit is the AQS

[Zchas13]

Just want to thank the advice off this thread for sorting my issue.

2008 d5 xc90 similar issues, non functioning passenger heated seat with no hot air on same side when heating on max.

New AQS from volvopartstrade on ebay for about 85quid and an hour of my time seems to have sorted it.