volvobrick

I hope someone can point me towards the right direction to solve my aircon blower problem.

Once in a while the blower would not run after I start my S8 (RHD with solar roof). The climate control buttons work, but no air comes out of the vents. It usually recovers after 10-15 minutes of driving, only for the malfunction to return several days later.

I have already replaced the air blower resistor module, and tried to look for the solar relay switch under the dash below the steering wheel (right side) but none of the relays seems to be linked to the blower.

Can anyone advise on the likely problems, and where the solar roof blower relay is located?

Mister Bally

As stated above, the brushes on the blower motors have a finite life. With the solar sunroof, the blower runs even more so the brushes wear out sooner.

VCDS scan will confirm the problem. It will probably suggest that you Replace the blower motor.

Without a diagnostic scan, you are wasting time and money.

volvobrick

Yes I did a scan before:

Address 08: Auto HVAC Labels: None Part No SW: 4E0 910 043 B HW: 4E0 820 043 G Component: KLIMAAUTOMAT 017 0450 Revision: 00000032 Serial number: 00000000116175 Coding: 0058097 Shop #: WSC 02311 785 00200 VCID: 1C31A432DFDCADFE675-8049
1 Fault Found: 01273 - Fresh Air Blower (V2) 009 - Open or Short to Ground - Intermittent Freeze Frame: Fault Status: 00101001 Fault Priority: 3 Fault Frequency: 12 Reset counter: 74 Mileage: 121456 km Time Indication: 0 Date: 2015.02.23 Time: 13:53:36

Does this point to replacing the blower motor?

Tks!

trustzzz

So did you replace the blower motor and solve the problem, because I got same fault code !

MP4.2+6.0

FWIW, I just helped/confirmed w/ yet another old AW'er that his blower motor also crapped out, and indeed he had the solar roof too. Seeming to be a pretty consistent theme. New fan (plus a refrigerant recharge) via an indy shop in his case, and all reported good.

Albatrossboss

I have the solar sunroof on mine as well and am having the same issues. My new blower motor will be installed this week.

volvobrick

I have the new motor. Yet to put it in as it involves more dismantling than I am comfortable to DIY! Will be sending it to a workshop with the proper tools to do the replacement.

PS I Have the solar roof too.

richard-tx

Replacment brushes are available.

Order a pair of L8-9H at Arrowhead.

• Flat Top Brushes with Top Lead(s)

richard

Mister Bally

That will come in handy next time. And with the way I keep cars, there will be a next time.

GradecEngineering

I really appreciate the info! Do you have personal experience with this brush p/n?

I've repaired dozens of blower motors and radiator fans over the years. The failure mode I've observed time and time again is corrosion around the brushes preventing the springs from doing their job. Mine just went out tonight and I don't have a solar roof. I'm hoping my brushes will be salvageable. I'll report my findings.