In 2015 Audi became the first premium manufacturer to use this technology in a production … It was fine before and it happens form … I've done some research on it and its caused from the condensation build up from turning your car off while the AC is still running. If your A5 Quattro smells bad when you turn on the heater or air conditioner, or it seems like the fan doesn't blow air as well as it used to, replacing your cabin air filter is a likely the best fix! Get yourself an aircon cleaner (sometimes referred to as an aircon bomb) - it's a small aerosol which you leave running in the car with the air con on full blast until the tin runs out. Matter of fact, the problem is so common, Audi made a TSB on it. Bought 2012 A5 used and unfortunately have been dealing with a somewhat sour smell coming from vents. A5oc Forum is an international Audi A5 … ... Audi A5 Forum & Audi S5 Forum. This is definately a common problem on a BUNCH of Audi models. Here are the most common reasons that you may be smelling a burning smell … Recently regassed the system as it was a little low, and after that it was working perfectly. It happens both when asking for hot or cold air( ac off & on ) . I have a musty smell in my air conditioning system when I first start the car. … Hi, my A/C was running absolutely fine with no smell at all. After these last fee hot days with A/C on, a unbearable smell like pee comes came through. I have a problem with my air conditioning on my A5. 2009-2012 Audi … If your Audi A5 has a burning smell, there are a few different reasons that this can happen. Ice cold, circulating properly, compressor … The first recall issued by the National Highway Traffic Safety Administration affects 143,214 Audi units. While there are a variety of reasons your Audi A5 Quattro air conditioning won't work, the most common 3 are a refrigerant leak, an electrical climate control issue, or a problem with the air conditioning … The video above shows you where the cabin air filter in your 2010 A5 … If you're getting that musty smell, it's usually caused by bacteria in the aircon system. The last few weeks a rotten eggs , foul smell has been coming into the cabin from the heater vents. Typically, the smell is caused by some type of fluid (oil, trans fluid, etc..) hitting the exhaust or other hot parts of the engine. Unpleasant "musty" odor from Heating and Ventilation system. Burning Smell Causes: Audi A5. It will kill the bacteria in the system and give a nice fresh smell. In the Audi Q7 e-tron quattro a heat pump with an electric compressor is responsible for heating and cooling. 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