Tim.. wrote:
"Tim Downie" wrote in message
...
Duncan Wood wrote:
On Thu, 25 Jun 2009 11:05:38 +0100, Tim Downie
wrote:

I have a friend with a 3 year old Audi A6 (2.7 diesel I think) that
has had a problem for a long time now with the aircon intermitantly
going a bit haywire and either blowing very hot or very cold.

Garage is at a loss as nothing shows up in the computer logs (and I
guess intellegent guesswork/diagnosis is beyond them) and because
the problem is only intermittant and typically never happens when
it's taken to the dealer.

Are there any common known problems with this car's aircon?

TIA

Tim


If it's random then you'll want to plug it into Vag-com & see what's
going on, normally it's a sticky flap or motor but interrogating
it's a lot easier than removing the dash.

Garage have already done that, hence the reason I said "nothing
shows up in the computer logs".

Find another garage then...!

Seriously, if it is blowing hot, and yet selected cold, it is quite
easy to see in the live data, what actuator or sensor is feeding back
the wrong info to the climate etc.

Yeah but, you say "live data". This problem is intermittant and never
happens when it's taken to the garage (as is the way with these things).

Tim