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Apologies for the gripe, but the forum has recently suffered from a spate of what can be termed ‘Post and Run’ new members, who seem to think it’s perfectly acceptable to post a plea for help, and simply not return to view the help given. In a more diluted form, help is offered, but is very rarely acknowledged even via. a simple press of the Like button, leave alone a posted Thank You. The last part of the gripe is that we frequently have to ask for additional information, and this extra detail often never materialises. Please remember, everyone who posts replies do so without payment, but it certainly does cost them in time - in terms of the Moderators and Admin back up - a lot of time. So a special plea to all on here who post needing help:- please be respectful enough to acknowledge any help given, rather than simply accept it as a no-cost, no time of yours, free advice service. It’s wearing thin folks, so if you want to retain this service, please respect and acknowledge its benefits. Thank you all for reading this, and above all, agreeing to adhere to the respect that is needed to be shown. Kind regards, On behalf of the Moderators. Please note:- This request is to all members, not just new ones. p.s. Please avoid using non specific locations such as U.K., England etc. etc.

So finally got to the bottom of this! The new genuine pressure sensor (from Audi) was faulty - simple as! changed it for another oe sensor, hey presto, got my AC back! As for the 'missing' air quality sensor....wasn't missing - it doesn't have one. My car came out of the factory with 'basic' AC climate control which doesn't utilise an air quality sensor........it seems that pre my ownership of the car, someone changed the climate control unit for the 'convenience' version, which does utilise an air quality sensor!

update: stripped the original motor and put o rings where the water was escaping, didn't fix it. bought a chinese copy motor which fixed the place it was leaking from but water was coming out of where the little white clip pops onto the motor. Tried siliconing it, didn't work so removed the metal clip on the tube the holds the clip on, and the clip and attached the tube directly to the motor, and it's fixed for less than 30 quid.

You can add more expanation Mark if you want. We don't charge by the word.