I have just brought another Audi after some wallace wrote my last one off and I have noticed that the air con remaining running slightly when you set the computer control to off. I have to set the fan direction to centre and close of the vents if I dont want any air con to come through. Is this normal in Audi models?
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First of all, are you sure it is a coolant leak and not the natural draining of the Air Con., a leak on piping to or from the washers, condensation from the exhaust etc.?
Does the coolant level drop significantly and if so, how much and over what period?
Can you collect in a tray the liquid that is leaking? What does it look and smell like and what colour is it?
Does it leak with the air con disconnected?
Does the heater work properly?
When you say that it is leaking 'right under the middle', I presume you mean the middle of the car. If you park over a newspaper, where does the drip end up (which might not necessarily be immediately below the leak)?
The only other thing then would be if the compressor is turning, engaging, and the cooling fan working properly. You should either be able to see the compressor clutch engage, as the switch is energized, or at least hear it click loudly when the switch is energized. If it is not, then there are sensors for the low pressure/high pressure line to tell the compressor when to function, that also have to be checked.
As the engine runs with the compressor turning, one line should be hot/warm, the othe,r (larger diameter hose) should be cool/cold, if the system is working properly.
If the compressor is turning when you have the A/C turned on, then see if the cooling fan is running as well. It must run to remove the heat and cause the process to function properly.
the aircon gas needs recharging in a car at least every 3 yrs.you also need to run it for at least 15mins a day(on average)to keep in tiptop condition.also dont forget to spray air con cleaner into air intake of heater to get rid of legionaires bug(really!!! )
it might be a few things unfortunatly, 77k is not much for these cars but allot can go wrong with them, i can start with, valve guid seals these tend to wear arround 100,000 but deppends on use, wether hard driving or town, so you could be getting close to these, you can also check visually if there is another leak from the valve cover on the rear side or this might just be ressidue from the previouse leak, sometimes the smell of unburnt fuel can fill the car if the wind is blowing in opposite direction when standing still can fill the cab with fumes dont worry only minor, it possibly is the cold air rather than smoke condensation from the exhaust is warm and hitting cold air will do that, it dosent realy sound drastic and just keep an eye on the fluid levels as you are doing but i dont think there is much to be concerned about....hope this helps
Happened to me too, when the ECO light comes on automaticly (and it only blows hot air) it means it's simply broke.
I don't know the exact production date of your car, but there is/was an airco-related dealer recall for some cars, so just contact your dealer and have it fixed, but don't forget to mention the recall (it might save you a lot of money when your warranty has already expired).
facia one fuse 25
facia two relay 16
facia three fuse 5, relay 2, relay 3
all three of the above panels are located on the drivers side (which in the diagram i have is righthand drive).
Those are pretty much all the fuses and relays that control your a/c. the clicking noise you hear is probably one of the three relays i've listed. now i don't know alot about audi's except i'll never own one. but i have a lot of information if you have other questions.
that flickering you noticed could be one of the relays failing or you have a short somewhere in the wiring.
anything else you need feel free to ask
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Incidentally the only reason that i can think of that those parts would melt is that the current is high on those wires. are there any recalls that you are aware of ?