soundbehindyou

I seem to have cold air (used a temp gauge), but the "roar" and typical cooling is weak....just not cooling the cabin and the auto works hard all the time but not cycling down to a reasonable temp. after reasonable time operating.

Could it be my cabin (polen?) filters are filthy, which they are (the two attached to the hood), and is there another 3r filter that may restrict the air flow?

Thanks for comments from this novice DIYer!

2001 S8

Could be a couple of things. See list (simplest to hardest) below and work your way down.

• Make sure all vents are open
• Check cabin filters (As you stated)
• AC system needs to be re-charged (I had this issue. Cold air but system could not keep up on an 80 degree or higher day. Re-charged the system and all is good.)
• Blower motor might be on its way out (Any squealing sound or change of speed)
• Individual vent flaps not working correctly (Closed when should be open or vice-versa. Do you hear any clicking/knocking sound coming from vents?)

Good luck.

soundbehindyou

System recharged and blowing cold - no sound from vents....how can I find out it flaps are open or closed correctly?
No squealing sound with blower motor?
Thanks for responding

2001 S8

Running Ross Tech/VAG and seeing if there are any shorts in the system.

Ross-Tech: VCDS

Good luck.

audinutt

Have you recently changed your blower motor?
I just bought 2 separate ones from the dealer a few months apart and both had the terminals in reverse orientation.
Result was a lot of blower noise and minimal flow.

I decided rather than return the unit or cut the wiring to reverse the polarity to the correct orientation to cut out the "key" in the connector with small cutters so I could reverse the polarity back to the correct orientation.

Final result= lots of flow

quattroworld.com Forums: change blower motor with new one today.. results minimal air flow... WTF?!

-Richard

John Gaffigan

Changing out the blower motor isn't a "tough" job, but requires a lot of patience. You'll need a REAL stubby screwdriver to get into the back screws. I saw a Youtube video that helped explain how the motor comes out. One adder...get a shop vac into the firewall housing to slurp up all the debris that is likely in there. The benefit of doing it yourself is that you can attend to the little adders too! Best of luck getting your airflow back.

omarcarbomb

I had my S8 AC serviced this summer because I felt it wasn't cold enough.
I was disappointed when I got it back so I got out my different temperature gauges and found that the air is nearly freezing cold (got temps in the 40's!)
The only thing I figured it could be was the rate of air flow but I couldn't imagine a fan failing by slowing down without some other sign like a bearing noise or some other sound or smell.

Is this a common D2 A8/S8 issue?
What is the specific failure?

2001 S8

I believe he came to the conclusion that the vent flaps were the issue. (my fifth bullet)

audinutt

On my cars, they were still blowing cold, it's bosch pinned the fans to be reverse.. so low flow.

Y888

Did anyone hear this shhhhhhh from the engine bay when you shut off the car.It is cooling pretty good but this sounds like a leak from ac pipes?Still blowing cold,2nd summer since i got it without recharge but this shhhh sound is telling me something is wrong.