Audi Repair Questions? Ask a Mechanic for Answers ASAP
Thank you for your question, my name is Steve and I am a fully qualified vehicle technician with over thirty years in the trade, hopefully I can help.
The most likley cause of the problem is that the gas pressure in the A/C system has dropped, this will mean that when the control is pressed it will operate the system then immediately switch off as the parameters are not met.
Quick fit are currently offering a free system check see this link click here and if you have one close to you this is a good option to get things checked before spending out.
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