Aircon just blowing warm air on hot days

[DirkOz]

I've done a dash-out air con retrofit once! I'd never do it again, as it was a real pain!
10 hours of pain!

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[Alister]

Can I just check with the other B7 (that's 2004–2008) RS4 owners if their aircon copes well on days over 25 degree's?

FWIW I never had an issue with mine in 5 years of ownership.

[IsDon66]

A VCDS check should tell you what's wrong, or at least get you looking in the right place.

My A6 kept faulting the pressure sensor, which was turning off the compressor. Exhibiting the same symptoms you have. Had it to 3 different Audi dealers and had two new sensors and a software update. Still not fixed.

In desperation I located the sensor myself (in front of the radiator) and with the engine running and a/c switched on by wiggling the wire I could turn the compressor on and off.

The only way I could tell the compressor was turning on or off was by placing my hand on the aircon pipe work as I wiggled. Pipe gets cold, compressor running. Pipe gets warm, compressor off

Turns out it wasn't the pressure sensor but the wiring to it. A previous shoddy repair using bullet connectors which had worked loose, as they all do.

[A4Mike]

Get it regassed that fixed mine

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[PaulyJ]

I have the same issue with my B7 A4 2.0T, getting it checked out in the next few weeks. Dropped it off at my local mechanic (not my usual one) just to get it checked, he said it still had plenty of gas and left it at that.
Will let you know what the issue is once properly diagnosed.
Keen to know what your issue is too.

[mbedford]

Will let you know what the issue is once properly diagnosed.
Keen to know what your issue is too.

My cars going in for its annual service end of Jan and they will look at the air-con at the same time so will provide an update here.

[beanoyip]

My car's passenger air con vents are taking longer than usual to be cool. Even when it eventually gets cool, it's not as cold as the driver's side.

[jnrdavo]

My S3 is a bit like that. I wonder if it's the foam that can break down over time clogging it up...

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[mbedford]

I nowadays when its over 25degrees, just press the air-con recirculation button so its not pulling in hot air, and set it to 20degrees, and it seems to be working pretty well. I also wrapped the 2 silver aircon pipes in the top left of the engine bay to insulate them. They are COLD and sitting in a HOT engine bay, so I thought to insulate them. Don't know if that helped much or not.

P.S. check out my young mechanic :)

RS4 engine.jpg

[mike]

My car's passenger air con vents are taking longer than usual to be cool. Even when it eventually gets cool, it's not as cold as the driver's side.

I would look at the air conditioner control valve. I’ve just replaced one in a golf GTD and it fixed that exact issue.


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